3321<\/a> Carlisle, 3221 Kirby, 3521 Sproat, 5621 Limerick, 8921 Carlisle variant) suggests that the ’21’ served as an internal manufacturing identifier for standard ringed-eye configurations, standardizing the supply chain across thousands of hardware stores.<\/p>\nSproat hooks were manufactured across a wide range of sizes, wire gauges, and finishes throughout the production era. Size No. 10 (as documented here) represents the mid-range general-purpose offering. Specialty variants included weedless Sproats (documented on original Pflueger store-display boxes) and snelled versions for mail-order bait suppliers. The Bronzed finish was the standard freshwater coating; Japanned and Tinned variants existed for specific applications.<\/p>\n
No major design revisions or rebranding events are documented for the 3521 series. The model remained in catalog continuously from the 1899 acquisition through at least the 1960s (final era before Shakespeare acquisition). This continuity reflects the proven efficacy of the design \u2014 once optimized for American machine production, the Sproat required no further refinement.<\/p>\n","named_collaborator_bio":"","era_dating_reasoning":"Packaging format and typography: Two box variants shown \u2014 one labeled '100' (smaller box, older format) and one labeled '1000' (larger commercial box format). Green cardboard exterior with letterpress typography in red and green ink typical of Pflueger's interwar and post-WWII production era. Model code 3521-Br explicitly documented in the manufacturer reference (Analyst Notes) as a standard Pflueger Sproat pattern produced from 1890s to 1950s. The Br suffix denotes Bronzed finish per documented finish conventions. No barcode present (pre-1974 strong indicator). Typography, paper stock, and box construction consistent with 1920s-1950s commercial tackle packaging. Both boxes marked 'MADE IN U.S.A.' and 'BY AMERICAN WORKERS OF AMERICAN MATERIAL' \u2014 nationalist advertising typical of Pflueger production during the Great Depression and WWII eras. The 1000-hook box format suggests commercial\/wholesale trade distribution rather than single retail card, consistent with Pflueger's dominant role in hook supply during this period.","fun_fact":"The Pflueger Sproat represents American tackle innovation at scale. By the 1920s, Pflueger's Akron factory produced over one hundred million hooks annually \u2014 a staggering volume achieved through automated forging and filing machinery that made hand-filing obsolete. Vice President Charles T. Pflueger famously maintained a private testing lake at his Green Township farm property, where the company conducted field trials on point penetration, wire temper, and barb holding strength. Hooks like the 3521-Br were the product of these rigorous mechanical tests, representing a direct lineage from European artisan traditions to American industrial standardization.","fun_fact_title":"One Hundred Million Hooks a Year","design_lineage":"The Sproat bend descends from British angling traditions of the 19th century, where it evolved as a refinement of earlier round-bend patterns. British makers such as Allcock and Redditch craftsmen standardized the parabolic curve, recognizing its superior holding power in soft-mouth fish species compared to more sharply angled bends (Limerick, Kirby). When Pflueger acquired the American Fish Hook & Needle Company of New Haven, Connecticut in 1899, they inherited not only manufacturing capacity but also a catalog of British-influenced bend families, including the Sproat.\r\n\r\nPflueger's innovation was not in bend geometry but in manufacturing method: they adapted the traditional Sproat design to American automated forging and filing machinery, eliminating hand-shaping and enabling mass production at scales that Redditch makers could not achieve. By the 1920s, the Pflueger Sproat in all sizes had become a commodity hook \u2014 ubiquitous in hardware stores, bait shops, and mail-order catalogs from coast to coast. This widespread availability made it the standard against which competing American manufacturers (Eagle Claw, South Bend, Heddon) measured their own Sproat offerings.\r\n\r\nThe 3521-Br maintained design continuity through Pflueger's entire production run (1920s\u20131950s). No documented redesigns or geometric variations suggest the pattern was considered optimized early and required no refinement. The model code itself \u2014 the recurring '21' suffix \u2014 indicates that ringed-eye Sproats across all sizes shared a unified manufacturing specification within Pflueger's internal taxonomy.","related_models":[{"model_code_related":"3521-Br","description":"Sproat No. 10, Bronzed finish, this specimen","relationship":"this_model","related_model_url":""},{"model_code_related":"3521-J","description":"Sproat, Japanned finish variant","relationship":"variant","related_model_url":""},{"model_code_related":"3366-G","description":"Sproat, Gold-plated variant (per analyst notes cross-reference)","relationship":"variant","related_model_url":"https:\/\/garrenwood.com\/wp\/hook-reference\/o-mustad-son-hooks\/o-mustad-son-3366\/"},{"model_code_related":"3321-Br","description":"Carlisle, Bronzed finish \u2014 contemporary alternative bend family","relationship":"companion","related_model_url":"https:\/\/garrenwood.com\/wp\/hook-reference\/pflueger-hooks\/pflueger-hooks-3321\/"}],"primary_application":"The Sproat bend is a foundational pattern for general freshwater bait fishing and light saltwater work. Characterized by a smooth, parabolic round bend with minimal or no offset, the Sproat prioritizes holding strength and penetration over mechanical leverage. The Pflueger 3521-Br in size No. 10 is sized for live or cut bait fishing for warm-water panfish (bluegill, crappie, catfish in the 0.5\u20132 lb range), small to medium bass (1\u20133 lbs), and light saltwater species such as small snappers or pompano.\r\n\r\nThe ringed eye allows reliable leader attachment without eye-twisting under load, and the superior point geometry (mechanically filed, near-straight inner taper) provides excellent penetration without the risk of splaying that a hollow-point construction might introduce under extreme bend stress. The standard wire gauge balances weight for live-bait presentation with sufficient temper to withstand casual leader knots and the mechanical shocks of small fish head-shakes.\r\n\r\nHistorically, Sproat hooks in this size and finish were also used for light stream trout fishing with caddis or mayfly nymphs fished on short leaders, though fly-tying demand was secondary to bait applications during Pflueger's commercial peak. The Bronzed finish was preferred for freshwater work due to its rust resistance and subtle appearance in clear water \u2014 unlike the brighter Tinned finish favored for saltwater visibility.","secondary_applications":"Light fly nymph fishing for trout (rare); small live-bait rigging for crappie and bluegill; light saltwater bait fishing for snappers and small groupers (uncommon); display specimen for hook collections or Pflueger manufacturing history.","fly_patterns":"Not typically used for fly tying. The straight-ring Sproat was primarily a bait-hook pattern; fly tiers typically preferred looped-eye variants or Sproat patterns from specialist fly-hook manufacturers.","modern_equivalents":[{"hook_model":"Mustad 3366","match_quality":"very_good","equiv_notes":"Contemporary Mustad Sproat in standard sizes; slightly lighter wire and automated chemically-sharpened points differ from vintage Pflueger mechanical filing. Geometry is close match.","modern_equivalent_url":"https:\/\/garrenwood.com\/wp\/hook-reference\/o-mustad-son-hooks\/o-mustad-son-3366\/"},{"hook_model":"Eagle Claw 139","match_quality":"good","equiv_notes":"Sproat pattern with ringed eye; American manufacture. Lighter wire and different point geometry than vintage Pflueger.","modern_equivalent_url":""},{"hook_model":"Gamakatsu Roundbend","match_quality":"moderate","equiv_notes":"Modern Japanese interpretation of Sproat-type parabolic bend; wire gauge is lighter and point is hollow rather than superior.","modern_equivalent_url":""}],"hook_type_application":["sea_trout","bait","saltwater"],"collectability_rating":4.5,"collectability_summary":"Rated 4.5\/10 \u2014 the Sproat bend is a standard, widely-produced pattern from a major American manufacturer, but original Pflueger packaging in this era is less commonly preserved than later Hande-Pak tins. Original boxes with complete or near-complete hook counts command modest collector interest, particularly among Pflueger specialists and American tackle historians.","collectability_detail":"The Pflueger Sproat 3521-Br occupies an interesting middle ground in the vintage hook market. As a standard bend family produced in volume by the largest American hook manufacturer during its peak years (1920s-1950s), the hooks themselves are not rare. However, original packaging from this era \u2014 particularly the earlier, smaller box format \u2014 is far less commonly preserved than the iconic Hande-Pak metal tins of the 1930s-1950s. Complete or near-complete boxes in good condition attract moderate collector attention from several segments: Pflueger specialists seeking comprehensive catalog documentation, American tackle historians studying interwar manufacturing practices, and regional collectors focused on Akron industrial history.\r\n\r\nSize No. 10 is a mid-range, versatile freshwater size that remains functional, which slightly reduces pure collector value compared to scarce specialty sizes. The Bronzed finish, while standard for Pflueger, develops a warm patina over decades that many collectors find aesthetically appealing \u2014 this finish is less susceptible to aggressive corrosion than Japanned hooks, making specimens more likely to survive in presentable condition. The ringed eye (straight_ring) is a common feature of the era and does not elevate rarity.\r\n\r\nPremium factors: Sealed or near-sealed boxes with 100% hook counts; the smaller '100-count' box format (appears older\/rarer than the larger 1000-count commercial format); all original packaging intact with minimal wear to typography; hooks showing no corrosion or only light patina. Limited factors: Missing hooks reduce value significantly (typically 20-30% deduction per missing hook); heavy water staining or foxing on box; loss of the lid (if a removable-lid format). The presence of two distinct box formats in this specimen set suggests they may represent different production runs or distribution channels \u2014 this multiplicity actually reduces collectability slightly, as neither format is uniquely rare.","rarity":"uncommon","market_value_low":12,"market_value_high":28,"market_value_notes":"Low ($12): Good condition \u2014 original box opened, 90-100% hook count present, light surface wear to printing and cardboard, hooks bright or light patina.\r\nHigh ($28): Excellent condition \u2014 sealed or near-sealed box, complete 100-hook count confirmed, minimal printing wear, original tissue or interior material intact.\r\nPremium factors: Sealed original packaging; complete factory count; small '100' format (appears less common than 1000-count boxes); minimal box wear or foxing; any factory handwritten notations or lot codes.\r\nPlatforms: eBay US (sold listings for Pflueger hooks in original packaging); dealer sales (vintage tackle specialists); regional online auctions.\r\nConfidence: (E) estimated \u2014 based on comparable Pflueger hook packaging sales (late 1920s-1950s era) observed at typical rate of $8-35 depending on format and condition. Limited direct sales data for this specific model; estimate anchored to general Pflueger Sproat pricing and comparable four-digit model boxes. Recommend market monitoring for confirmation.","where_to_find":"eBay (US and UK regional searches for 'Pflueger hook' or 'Pflueger Sproat'); vintage tackle dealers specializing in American hardware and fishing tackle; regional antique malls in Akron, Ohio and nearby Ohio cities (proximity to Pflueger factory location); online auction houses with fishing tackle specialties; Pflueger collector forums and private sales networks.","collector_id_tips":"","packaging_format_code":"GW-PF-01","packaging_description":"Two distinct original Pflueger boxes documented: (1) Smaller box labeled '100' \u2014 green cardboard with white\/cream interior label panel, red and green letterpress typography, slide-top construction, dimensions approximately 4.5 x 2.75 x 1.0 inches. (2) Larger commercial box labeled '1000' \u2014 green cardboard exterior, cream interior label panel, red and green letterpress typography, slide-top construction, dimensions approximately 8.0 x 4.0 x 1.5 inches. Both boxes feature: 'PFLUEGER' in large red script at top; 'SPROAT' in large green block letters (primary product identifier); model code '3521-Br' in green text; 'BRONZED' finish designation; size 'No. 10' in large numerals; printed claim 'Filed Point Ringed' (manufacturing feature); 'Rust Proof' claim; 'MADE IN U.S.A.' in green text; 'BY AMERICAN WORKERS' and 'OF AMERICAN MATERIAL' on separate lines \u2014 patriotic\/nationalist messaging. No barcode, no price markings visible. Paper stock is unbleached kraft cardboard with tan interior surface. Letterpress impression is sharp and consistent, typical of pre-WWII offset printing transition period. Green color is a signature Pflueger trademark evident across reel and lure packaging of this era.","packaging_condition":"","ebay_sold_listings":null,"ebay_history":{"ebay_date_range":"","ebay_avg_price":"","ebay_price_range":"","ebay_avg_shipping":"","ebay_total_sellers":"","ebay_data_notes":""},"meta_title":"Pflueger 3521-Br Sproat \u2014 Pflueger Hook Reference | garrenwood.com","meta_description":"Pflueger 3521-Br Sproat No. 10 \u2014 American bait hook, bronzed finish, ringed eye, mechanically filed point. 1920s\u20131950s production, collectible original packaging.","page_intro_paragraph":"The Pflueger Sproat 3521-Br is a foundational American freshwater bait hook produced by the Enterprise Manufacturing Company of Akron, Ohio, during the interwar and post-WWII era (c. 1920s\u20131950s). As the world's largest hook manufacturer, Pflueger produced hundreds of millions of hooks annually, and the Sproat bend \u2014 inherited from British angling traditions and standardized for automated American production \u2014 became ubiquitous in tackle shops, hardware stores, and mail-order catalogs from coast to coast. This size No. 10 example, preserved in original commercial packaging (both retail 100-count and wholesale 1000-count formats), represents the pinnacle of Pflueger's manufacturing dominance and the successful merger of British bend-family heritage with American industrial-scale production. The bronzed finish, mechanically filed superior point, and straight-ring eye configuration are characteristic of the era, and the hook remains functional and collectible. Pflueger ceased independent hook production in 1966 following acquisition by Shakespeare; all Pflueger hooks are now vintage collectibles.","primary_search_terms":"Pflueger Sproat, 3521-Br bronzed hook, vintage American bait hook, Pflueger No. 10, mechanically filed point, interwar tackle, Pflueger Akron factory, straight-ring bait hook","image_1_alt":"Pflueger Sproat 3521-Br No. 10 \u2014 packaging exterior showing green cardboard box with red and green letterpress typography, model code and specifications label on face, smaller retail format variant","image_2_alt":"Pflueger Sproat 3521-Br No. 10 \u2014 packaging exterior showing larger commercial 1000-count wholesale box variant with identical typography and color scheme","image_3_alt":"Pflueger Sproat 3521-Br No. 10 \u2014 close-up of hook point and barb showing mechanically filed superior point geometry and bronzed finish color","image_4_alt":"Pflueger Sproat 3521-Br No. 10 \u2014 full side-profile view of the hook showing overall proportions, parabolic bend curve, shank length, straight-ring eye, and superior point geometry","additional_sections":[{"acf_fc_layout":"preservation_tips","title":"Storage and Preservation","content":"Original Pflueger boxes should be stored in a cool, dry environment protected from direct sunlight and moisture. The green cardboard is susceptible to moisture absorption in humid conditions, which can accelerate foxing (brown paper spotting) and cause ink bleeding or label separation. Ideal storage conditions are 40\u201350% relative humidity and temperatures between 50\u201370\u00b0F.\r\n\r\nThe Bronzed finish is relatively stable and resistant to freshwater corrosion, but prolonged exposure to high humidity or salt air will cause tarnishing and eventual rust bloom on the hook surface. If the box is to be displayed, protect it from direct sunlight to prevent ink fading and cardboard deterioration. If hooks are removed from the box, store them individually in acid-free tissue or in a sealed container with a desiccant packet to prevent atmospheric moisture contact.\r\n\r\nNever attempt to clean the bronzed finish with abrasive materials, which will remove the patina and compromise the protective coating. Light patina (warm brown discoloration) that develops over decades is considered desirable by collectors and should be preserved. If hooks become tarnished, gentle handling with a soft cotton cloth and minimal water contact is sufficient.\r\n\r\nKeep the original box intact and unopened if possible. Once opened, reinforce the lid and side seams with archival-quality paper tape to prevent further cardboard separation. Store boxes upright (flat orientation preferred) on a shelf away from floor-level moisture and vibration. Do not stack heavy objects on top of stored boxes, as this will crush corners and compromise structural integrity."},{"acf_fc_layout":"primary_source_analysis","title":"Packaging Text and Manufacturing Claims","source":"Pflueger Sproat 3521-Br original box labels, both '100' and '1000' formats","content":"'Filed Point Ringed':<\/strong> This explicit claim emphasizes Pflueger's manufacturing process and addresses a market distinction between hooks with mechanically filed points versus hollow-point construction. Competitors (particularly European makers and some American producers) favored hollow points for certain applications. By highlighting 'Filed Point,' Pflueger was asserting the superiority of their mechanically sharpened, nearly straight-taper point geometry \u2014 a feature that the company promoted as offering better penetration and resistance to splaying under stress.\r\n\r\n'Rust Proof':<\/strong> A marketing claim that requires historical context. Pflueger did not use stainless steel (which was not widely available for fishing hooks in the 1920s\u20131950s), and the Bronzed finish, while rust-resistant, is not truly 'rust-proof' by modern standards. This claim is best understood as relative advertising language: the Bronzed finish provided superior corrosion resistance compared to bare high-carbon steel or japanned finishes when used in freshwater. The claim reflects confidence in the oxidation-based finish process.\r\n\r\n'Made in U.S.A. \u2014 By American Workers \u2014 Of American Material':<\/strong> A distinctive nationalist message reflecting the economic and political context of the Depression and WWII eras. This phrasing was not legally required (U.S. country-of-origin marking was mandated, but not this specific patriotic language) and represents Pflueger's deliberate brand positioning as a domestic, American-made alternative to imported European hooks (particularly from Redditch, England). This messaging appears consistently on Pflueger boxes from the 1930s through the 1950s and is a strong indicator of this specific production window.\r\n\r\nBox format and count:<\/strong> The two boxes (100 and 1000 hook counts) represent distinct distribution channels. The smaller '100' box suggests retail trade \u2014 a card or box that a fishing tackle shop might display and sell over the counter. The larger '1000' box is a commercial format designed for wholesale distribution to hardware stores or mail-order suppliers who would repackage hooks in smaller quantities. Both boxes use identical typography and design language, indicating they were produced from the same factory specifications but serve different market segments."},{"acf_fc_layout":"size_anomaly","title":"Size No. 10 \u2014 Dimension and Classification Notes","content":"The documented size 'No. 10' is a legacy numerical classification inherited from 19th-century British hook sizing standards, where lower numbers indicated larger hooks and higher numbers indicated smaller hooks. Size No. 10 occupies the lower-mid range of the freshwater bait-hook spectrum \u2014 larger than delicate fly-tying sizes (16, 18, 20+) but smaller than coarse-fishing or saltwater patterns (2\/0, 4\/0, 6\/0+).\r\n\r\nThe measured overall length of ~0.57 inches (14.5 mm) is consistent with published specifications for a No. 10 bait hook across multiple manufacturers (Mustad, Eagle Claw, older Allcock examples). The gap width of ~0.21 inches (5.3 mm) is proportional to this size and allows live bait (small shiners, minnows, grasshoppers) to be hooked through the lips without excessive tissue damage or restriction of natural movement.\r\n\r\nPflueger's size classifications across the 3521 series span from very small (size 16, 18) through large bait-hook sizes (2\/0, 4\/0), with No. 10 serving as a versatile, general-purpose middle ground. This size was particularly popular for panfish (bluegill, crappie) and small bass (1\u20133 lbs) in freshwater streams and lakes, making it one of the most commonly encountered Sproat sizes in surviving inventory."},{"acf_fc_layout":"custom_section","title":"Pflueger's Hook Numbering System and Model Code Decryption","content":"The model code '3521-Br' follows Pflueger's documented alphanumeric taxonomy. The four-digit base (3521) does not map directly to individual bend families in a simple, linear fashion (as documented in the analyst reference material). Instead, Pflueger employed a more complex internal system where the first digit may relate to product tier or manufacturing line, the middle digits to bend family or size range, and a consistent '-21' suffix that appears across multiple bend families (3221 Kirby, 3321 Carlisle, 3521 Sproat, etc.), suggesting that '-21' designates standard ringed-eye configuration.\r\n\r\nThe alphabetic suffix (Br = Bronzed) explicitly identifies the finish applied to the hook. Other documented suffixes include: J (Japanned\/black lacquer), T (Tinned\/hot-dip), G (Gold-plated, per analyst notes), and unmarked bright\/polished finishes. This suffix system allowed hardware clerks and tackle shop owners to quickly distinguish finish variants from a distance \u2014 critical in an era before widespread packaging color standardization.\r\n\r\nPflueger's numbering scheme was more systematic than many competing American manufacturers, but it was never published in detail to the public. Collectors and researchers must rely on surviving catalogs, box labels, and archival invoices to decode the full taxonomy. The analyst reference material notes that 'a full numbering decode has not been located in the open literature' \u2014 meaning that no comprehensive, authoritative guide to all Pflueger model numbers exists in modern hook references. Period Pflueger catalogs (1897\u20131960) remain the definitive source."}],"is_snelled":false,"snell_material":"","snell_grade":"","snell_length":"","snell_attachment":"","snell_color":"","snell_count":"","snell_condition":"","snell_condition_notes":"","snell_card_format":"","snell_card_style":"","snell_notes":""},"_links":{"self":[{"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/pages\/13461","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/comments?post=13461"}],"version-history":[{"count":4,"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/pages\/13461\/revisions"}],"predecessor-version":[{"id":16098,"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/pages\/13461\/revisions\/16098"}],"up":[{"embeddable":true,"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/pages\/9267"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/media\/13465"}],"wp:attachment":[{"href":"https:\/\/garrenwood.com\/wp\/wp-json\/wp\/v2\/media?parent=13461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}