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The Mustad 3573 is a mid-tier vintage double fly hook manufactured by O. Mustad & Søn in Oslo, Norway, during the classic era of industrial hook production (c. 1925-1970). The hook features a Superior point geometry (near-straight inner taper for balanced penetration and durability), a Sproat bend (parabolic curve providing exceptional stress distribution), turned-down ball eye (standard for general fly work), and bronzed finish (warm, naturalistic color suitable for clear freshwater streams). The model code designation places the 3573 in Mustad’s ‘Quality’ tier (3000-3999 range), indicating manufacturing to exacting standards for sport and commercial fly-fishing applications.
The double-hook configuration—where two distinct point-and-barb sections are forged into a single shank—represents a now-obsolete design philosophy from an era when anglers and manufacturers believed multiple hooks on a single steel frame increased catch probability. The specimen documented here retains its original cardboard box and eight-line Mustad label, providing complete era evidence: ‘Oslo – Norway’ geographic designation (post-January 1, 1925), letterpress print, hand-written size notation in period ink, and absence of barcode (pre-1974 strong indicator). The packaging label exemplifies the standardized typographic format Mustad employed globally from the 1920s through the 1990s.
Historically, the 3573 occupies the practical middle ground between economical bulk models and premium specialized hooks, making it a reliable, versatile choice for mid-twentieth-century fly fishers. Surviving examples with intact original packaging are increasingly scarce, particularly the double-fly configuration, making this hook of genuine interest to vintage tackle collectors, Mustad historians, and fishing heritage researchers. The Superior point designation and Sproat bend are well-documented, respected design elements, and the bronzed finish is particularly prized by collectors for its warm, aged patina.
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The Superior point geometry employed on the 3573 features a near-straight inner taper from barb to tip, creating a nearly flat interior face and a relatively fine—though not razor-thin—tip. This design concentrates penetration force at the apex while maintaining structural strength, preventing the point from rolling, dulling, or fracturing upon impact with hard substrates or forceful strikes. The geometry mandates a moderately firm hook-set to achieve full penetration, in contrast to hollow points which penetrate with minimal applied force.
The Sproat bend distributes mechanical stress evenly across the bend radius through its parabolic curve, making it exceptionally resistant to straightening or fracturing under heavy, sustained load. This mathematical optimization of stress distribution explains the Sproat’s near-universal adoption for both wet fly and general bait-fishing applications. The standard round wire profile (not forged) maintains consistent diameter throughout the shank and bend, ensuring uniform material properties and predictable behavior under load.
The bronzed finish—a specialized baked-on lacquer formulated to mimic the visual and protective properties of bronze—provides excellent rust resistance while offering a muted, naturalistic color profile suitable for clear freshwater streams where unnatural metallic flash might spook fish. The finish is exceptionally durable and suitable for extended saltwater exposure, though not as corrosion-resistant as heavy tinning or japanning.
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O. Mustad & Søn was founded in 1832 in Gjøvik, Norway, initially as Brusveen Spiger- og Staltradfabrikk, specializing in nails and steel wire. The company was renamed O. Mustad & Søn when acquired by Ole Hovelsen Mustad and his son Hans Mustad. The pivotal innovation occurred in 1877 when Mathias Topp invented the first fully automated hook-making machine, a breakthrough that allowed continuous wire feed with automated cutting, bending, barbing, and pointing at unprecedented scale.
Rather than patent this technology, Mustad relied on corporate secrecy and strict factory access controls to maintain competitive advantage. This strategy proved devastatingly effective against rival hook-making centers in Redditch, England, and manufacturing hubs in Japan and the United States. By the 1950s, Mustad controlled approximately 50 percent of the global hook production market, with sales offices and manufacturing facilities across multiple continents. The Mustad name became virtually synonymous with the fishing hook itself.
The Mustad 3573 belongs to the mid-tier ‘Quality’ classification (3000-3999 range) within Mustad’s numerical quality coding system. This tier represented products manufactured to exacting dimensional and tempering standards, positioned between economy models (1000-2999) and premium specialty hooks (4000+). The 3573 specifically designates a double fly hook—a configuration where two distinct point-and-barb sections are forged into a single shank, allowing a tier to dress two separate fly bodies on a single length of steel.
The ‘Superior’ designation on the label refers to the point style geometry (near-straight inner taper for structural durability and balanced penetration) and served as a product line name indicating premium, all-purpose construction. The Superior point series was engineered and marketed throughout the mid-twentieth century as a reliable, versatile option suitable for both commercial fly production and discerning sport anglers. The 3573 remained in the Mustad catalog through the late 1990s before being discontinued during the transition to the modern Signature Series nomenclature (c. 2001-2009).
Packaging label shows 'Oslo - Norway' on Line 3, confirming post-January 1, 1925 manufacture (Oslo designation; Christiania designation would indicate pre-1925). No barcode visible, consistent with pre-1974 production. Letterpress-style print with ornamental border design typical of mid-20th-century Mustad retail packaging. Paper stock and print quality consistent with 1925-1970 era. Hand-written size '4' in purple/violet ink on label consistent with manual inventory marking of vintage period. No UPC barcode, no modern postal ZIP code formats. Eight-line label format confirms vintage era (discontinued c. 2001-2009 with transition to Signature Series). Double fly hook design and Superior point designation align with classical Mustad catalog circa 1930s-1960s.
The double fly hook configuration reflects a now-forgotten era of fishing innovation where anglers and manufacturers experimented with multi-point designs to increase hook density on a single piece of steel. In the early-to-mid twentieth century, double fly hooks were considered practical solutions for increasing catch probability, particularly in competitive commercial and subsistence fishing. However, the design gradually disappeared by the 1980s as modern fly-fishing culture came to prioritize single-point presentation, refined leader construction, and ethical catch-and-release practices. The 3573 Double Fly Hook is a tangible artifact of this vanished manufacturing philosophy—a time when 'more hooks' was considered better than 'better presentation.'
The Mustad 3573 is a classic double fly hook designed for traditional wet fly and general fly tying applications. The Sproat bend provides excellent mechanical holding power and even stress distribution, making it suitable for both delicate trout presentations and more robust saltwater and pike patterns. The turned-down ball eye accommodates a wide variety of knot types, from improved clinch knots to loop knots.
The Superior point geometry offers a balance between penetration and durability—adequate initial penetration for soft-mouthed species while maintaining structural integrity against bone and hard substrates. This hook was particularly favored for classical Scottish and Irish wet fly patterns in the mid-twentieth century.
Light bait fishing, nymph patterns, small streamer flies
Not specifically documented with named patterns, but suitable for classical wet fly dressing (e.g., Mallard and Claret, Greenwells Glory, Wickhams Fancy) and general dry fly and streamer applications in size 4
| Hook | Match Quality | Notes |
|---|---|---|
| Mustad C49SNP (Modern Signature Series) | Moderate | Modern Mustad equivalent for general freshwater fly work; however, discontinuation of double-hook category means no direct modern double-fly successor exists in the Mustad line |
| Tiemco 7989 Wet Fly (Single Point) | Good | Single-point Sproat-equivalent wet fly hook with similar bend profile and versatility; represents modern successor to the single-hook application of the 3573 design philosophy |
| Partridge SH (Single Hook Sproat) | Good | Redditch-tradition Sproat bend with similar stress distribution properties; available in bronzed finish, carries forward the classical Sproat heritage |
The Mustad 3573 represents a middle-tier vintage product with modest collecting interest. Double fly hooks are relatively uncommon in modern fishing, and surviving examples with original vintage packaging are increasingly scarce. However, the hook's production run spanned approximately 45 years, and many thousands were manufactured, limiting premium rarity. Era evidence (pre-1925 'Oslo' designation, absence of barcode, letterpress printing) firmly establishes authenticity and historical context.
Positive Factors: The combination of original eight-line Mustad label, pre-barcode construction (indicating pre-1974 manufacture), and documented Oslo production location creates strong collectability appeal for vintage tackle enthusiasts and Mustad catalog researchers. Double fly hooks represent a now-obsolete configuration, making surviving examples historically significant. The Superior point designation and Sproat bend are respected, documented design elements. The bronzed finish and size 4 (intermediate, versatile size) have broad appeal. Hand-written inventory notation and maker’s mark add provenance documentation.
Limiting Factors: The 3573 is not a premium or specialized model; it occupies the middle tier of Mustad’s quality coding system and lacks the scarcity of high-end premium models (4000+) or rare economy variants. Production volume was high, and surviving examples are not exceptionally rare. The double-hook configuration, while historically interesting, has limited utility to modern fly fishers, reducing end-user demand. The model lacks strong association with a specific named fly pattern or celebrated fishing tradition. Box condition is merely ‘good,’ not ‘mint’ or ‘excellent,’ which moderates collector premiums.
Cardboard box with affixed printed paper label bearing the Mustad Key Brand trademark (skeleton key graphic) at upper left. Label layout follows the standardized eight-line Mustad format: manufacturer name (O. Mustad & Søn), location (Oslo, Norway), quality code (Qual. 3573), point designation (Superior), hook pattern (Mustad-Double Fly Hooks), eye type and finish modifier (T.d. ball-eye Bronzed), origin (Made in Norway). Quantity notation reads '100 No. 4' with the size hand-written in purple/violet ink. Label border features repeating asterisk ornament. Box exterior is kraft cardboard, off-white to pale cream color, showing light aging and wear consistent with vintage storage. No barcode. All text printed via letterpress on bright white label stock affixed to box lid.
Estimated range for a complete original box with 100 hooks in good condition. Premium pricing applies if box condition is 'excellent' to 'mint' (add 25-50%). Unboxed individual specimens trade at $3-8 each. Values are strongest on specialist vintage tackle platforms (eBay vintage fishing equipment, specialized Mustad collecting forums, classic tackle dealer catalogs). Regional variation occurs—UK and Norwegian collectors command slightly higher prices due to local heritage value. The hand-written size notation and era evidence (Oslo designation pre-1925) support the upper range. Rarity does not justify extreme premiums given the production volume and middle-tier designation.
eBay (vintage fishing tackle category), specialist vintage fly-fishing dealers, online Mustad catalog archives, tackle fairs and fishing heritage exhibitions, antique sporting goods dealers, specialized UK and Norwegian vintage tackle forums and collector networks
Store the Mustad 3573 in a cool, dry environment away from direct sunlight and excess humidity. The bronzed finish is susceptible to patina development and oxidation when exposed to moisture, which vintage collectors often consider desirable as it reinforces the hook’s historical authenticity. However, aggressive rusting should be prevented through proper environmental control.
Original packaging (cardboard box with paper label) adds significant collectible value—store hooks on the original card rather than loose, and avoid folding or creasing the label. If the box or label shows signs of foxing (age-related brown spotting) or minor discoloration, this is normal for archival artifacts and should not be cleaned aggressively; gentle dry-brushing with a soft, natural-fiber brush is preferable to any chemical treatment.
Avoid contact with other metals to prevent galvanic corrosion. Do not store in sealed plastic containers, which trap moisture; use archival-quality acid-free paper or cloth instead. If the hooks are displayed in a tackle cabinet or museum case, maintain relative humidity between 30-50 percent. Inspect periodically for signs of rust development or deterioration, particularly in the eye and bend areas where stress concentrates.
Handle specimens carefully to avoid unnecessary wear on the bronzed finish and damage to the paper label. Use cotton gloves when handling to prevent skin oils from accelerating corrosion.
Source: O. Mustad & Søn; Mustad Label Typology decryption framework applied to specimen documentation.
The Mustad 3573 label exemplifies the standardized eight-line typographic format that Mustad employed from the 1920s onward. Following the Mustad Label Typology, the label elements decode as follows:
Line 1: ‘O. MUSTAD & SÖN’ — Corporate manufacturer identity and brand integrity assertion. The ‘Ö’ reflects Norwegian orthography and authentic Mustad branding.
Line 2: ‘Manufacturers’ — Industrial role clarification, distinguishing Mustad as the primary manufacturer rather than a jobber, distributor, or repackager.
Line 3: ‘Oslo Norway’ — Geographic origin and critical dating marker. The presence of ‘Oslo’ designation (rather than ‘Christiania’) confirms manufacture on or after January 1, 1925, when the Norwegian capital was officially renamed from Christiania to Oslo.
Line 4: ‘Qual. 3573’ — Model code within Mustad’s hierarchical quality tier system. The 3000-3999 range denotes mid-tier ‘Quality’ models manufactured to exacting dimensional and tempering standards, positioned between economy models (1000-2999) and premium specialty hooks (4000+).
Line 5: ‘Superior’ —This line is reserved exclusively for hook point specification. On this label, ‘Superior’ denotes the point style—a near-straight inner taper characteristic of superior-point geometry, providing durability and reliable penetration without the extreme delicacy of hollow points.
Line 6: ‘Mustad-Double Fly Hooks’ — Pattern nomenclature. The ‘Double Fly’ designation identifies the distinctive two-point configuration and intended application (fly tying).
Lines 7-8: ‘T.d. ball-eye Bronzed’ + ‘Made in Norway’ — Eye type modifier (turned-down ball eye, abbreviated T.d.), metallurgical finish (bronzed), and origin reassertion.
Hand-Written Size Notation: The size ‘No. 4’ appears in purple or violet-colored fountain pen or ballpoint ink, indicating manual inventory marking by a shopkeeper or distributor. The color and ink formulation are consistent with mid-twentieth-century commercial marking practices, adding provenance documentation to the package.
The double fly hook configuration represents a now-vanished design philosophy rooted in early-to-mid twentieth-century fishing innovation. Manufacturers and experienced anglers reasoned that forging two point-and-barb sections into a single shank would increase hook density, potentially improving catch probability in situations where a single point might fail or prove insufficient for securing active prey.
The design proved particularly attractive for commercial fishing operations, subsistence anglers in resource-rich environments, and experimental fly-fishing practitioners seeking to maximize efficiency. The Mustad 3573 and similar double-hook models were marketed as practical solutions for increased productivity, and they found genuine application in competitive and commercial fishing contexts throughout the mid-twentieth century.
However, by the 1970s and 1980s, the double-fly configuration gradually disappeared from mainstream manufacture as fly-fishing culture evolved toward refined presentation aesthetics, sophisticated leader construction, and increasingly strict ethical standards surrounding catch-and-release conservation. Modern fly fishing emphasizes single-point hooks paired with precision casting technique, delicate leader tapers, and selective fish handling—values fundamentally opposed to the ‘more hooks = more fish’ philosophy that spawned the double-fly design.
The survival of specimens like the Mustad 3573 therefore provides a tangible window into an obsolete manufacturing era and a bygone fishing philosophy. It is a cultural artifact as much as a practical implement—a material record of how tackle design, fishing practice, and environmental ethics have fundamentally transformed within a single human lifetime.
| P | Photographically verified — Directly observable in the photograph(s) on this page. |
| V | Verified by documentation — Confirmed by manufacturer catalog, spec sheet, or published reference. |
| I | Inferred — A logical deduction from observable or documented evidence, not directly stated. |
| E | Estimated — An approximation based on visual comparison, proportional analysis, or limited data. |
| S | Speculative — A reasoned hypothesis that cannot be confirmed from available evidence. |
Claims with no notation are confirmed by multiple independent sources. All photographs on garrenwood.com are taken on a measurement grid where each square equals 1/10 inch (0.1″ / 2.54 mm).
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