Record summary

The Mustad 3665A Limerick is a mid-20th-century bait hook manufactured by O. Mustad & Son (U.S.A.) Inc. in Auburn, New York, under the Key Brand label. This hook exemplifies the practical design philosophy of 1960s-1970s commercial fishing tackle — a robust, simple tool for live and cut bait fishing in freshwater and light saltwater applications.

The 3665A features a classic Limerick bend with a sharp hollow point, round standard-gauge wire, and a tapered eye. The No. 4 size measures approximately 1.81 inches overall with a 0.30-inch gap, making it suitable for medium baits and small to medium game fish. The bronzed finish provides rust resistance and a traditional appearance consistent with period tackle standards.

Era evidence includes the Auburn address and Key Brand logo on the box (Mustad’s US subsidiary operated from 1956 onward), offset printing on kraft cardboard packaging, and the absence of a Universal Product Code (pre-1974). The 100-hook bulk package format indicates commercial or wholesale distribution, common for working anglers and bait shops during the 1960s-1970s.

Collectors value the 3665A as a representative example of post-war American sporting goods manufacturing and Norwegian hook engineering applied to the domestic market. The original packaging, condition, and straightforward design appeal to historians of mid-century fishing tackle traditions.

Technical profile

Eye

Tapered Eye, Turned Down The eye is a tapered design formed by the wire tapering gradually to a pointed end with no ball or bulge P. The taper is clean and symmetrical, allowing thread or line to seat snugly against the shank P.

Wire

Standard, Round, Est. ~0.064"-0.072" (~1.63-1.83 mm) E

Shank

4X Long

Bend

Limerick, Standard gap The Limerick bend exhibits the characteristic angular, high-domed geometry with a sharply defined apex P. The bend shows no offset or kirb — the point tracks directly in line with the shank when viewed from above P. The bend radius is moderate and symmetrical, typical of mid-20th-century production standards E.

Point

Hollow Point (concave inner face) The barb is a short, perpendicular cut typical of Limerick design, positioned immediately behind the hollow point taper P. The barb angle is approximately 45 degrees relative to the shank axis, providing secure hold without excessive damage to soft baits E.

Finish

Bronzed — Inferred (photographically likely) The bronzed finish displays a warm, chocolate-brown tone with even coverage across all surfaces P. The specimen shows minimal patina or corrosion, indicating good preservation conditions and rust-resistant application quality typical of Mustad's 1960s-1970s bronzing process P.
The hooks on this specimen are bright and sharp with no visible corrosion, pitting, or wear P. The original kraft cardboard box shows light toning and a handwritten price mark in pencil, consistent with retail stock from the early 1970s P. The blue and tan printed label remains well-adhered with minimal fading P.

Historical context

mustad

O. Mustad & Son was founded in 1832 by Ole Mustad in Gjøvik, Norway. The company became one of the world’s largest hook manufacturers, establishing dominance through vertical integration of wire drawing, hook forging, and packaging. Mustad’s Norwegian factory developed reputation for quality standardization and innovative point designs, including the hollow point geometry that defined 20th-century hook engineering.

In 1956, Mustad established a U.S. subsidiary corporation — O. Mustad & Son (U.S.A.) Inc. — headquartered in Auburn, New York. This operation handled distribution, repackaging, and marketing for North American markets under multiple brand names including Mustad, Key Brand, and regional imprints. The Auburn facility imported bulk hooks from Gjøvik and packaged them into wholesale and retail quantities for tackle shops, mail-order distributors, and commercial fishing suppliers.

The Key Brand imprint was Mustad’s economy line distributed through Auburn. It offered identical hook designs to premium Mustad-branded products but at lower retail price points, competing directly with American domestic manufacturers like Wright & McGill and Pflueger. The 3665A Limerick was a core item in the Key Brand catalog throughout the 1960s and 1970s, available in large bulk quantities for commercial and institutional fishing applications.

Series History

The Mustad 3665A belongs to the Limerick bend family, one of the oldest and most successful hook designs in sport and commercial fishing. The Limerick bend originated in Ireland in the 19th century and was adopted by English and Norwegian manufacturers as a standard pattern for freshwater and light saltwater bait fishing.

Mustad introduced its own Limerick variant in the early 20th century and refined it through successive production eras. By the 1960s, the 3665A represented the standardized version — a medium-weight hook on round wire with a tapered eye and a sharp hollow point, optimized for natural bait presentations.

The 3665A was available in sizes ranging from No. 1 (large) through No. 10 (small), packaged in bulk quantities from 50 to 1000 hooks per box for commercial wholesale distribution. It competed directly with equivalent Limerick patterns from Partridge of Redditch and Wright & McGill, all filling the same market niche for working bait anglers, commercial fishermen, and tackle retailers.

Production continued through the 1980s with minor manufacturing refinements but no significant design changes. The 3665A has been discontinued in its original form, though Mustad continues to manufacture Limerick hooks under modern model numbers.

Era and Packaging Dating

Multiple packaging elements confirm circa 1960-1975 production: (1) The Auburn, New York address for O. Mustad & Son (U.S.A.) Inc. — Mustad's US subsidiary operated from 1956 to the mid-1980s, placing the hook in that window. (2) Absence of a barcode or UPC — the Universal Product Code was adopted in North America beginning 1974, so no barcode indicates pre-1974 or very early 1974 manufacture. (3) The offset printing method on kraft cardboard is characteristic of 1960s-1970s tackle packaging, predating flexographic and digital printing. (4) The Key Brand logo style and the blue/tan color scheme are consistent with Mustad's US product line during the 1960s-1970s. (5) The handwritten price mark '72-' in graphite suggests a retailer's inventory or pricing notation from the early 1970s, consistent with retail stock from that era.

Design lineage and influence

The Limerick bend originated in Ireland during the 19th century as a refinement of earlier generic round-bend patterns. English manufacturers — notably Redditch makers such as Allcock and Partridge — adopted and standardized the Limerick geometry by the 1870s-1880s, using it for both fly fishing and bait applications.

Mustad adopted the Limerick design in the early 20th century and manufactured it alongside imported English Limerick hooks, eventually establishing its own Norwegian version as a dominant global standard. The 3665A represents the mature, production-optimized iteration of this lineage.

Competing contemporary designs included the Aberdeen bend (wider, lighter) and the Sproat bend (more rounded), both of which occupied similar market positions but with slightly different profiles. The Limerick’s angular geometry proved superior for bait fishing where quick penetration and reduced barb damage were valued, cementing its position as the 20th-century standard.

Modern successors include the Mustad 3904 (Aberdeen variant) and the contemporary Mustad Limerick hooks still manufactured in Norway and distributed globally. The 3665A’s design influence persists in budget and commercial hook lines across multiple manufacturers.

Best matchRelated by Attribute

Computed automatically from catalog data — updated as new hooks are added.

Silhouette	Hook Model	Match	Analysis	Compare
	765SP No. Size 4 and Size 6 — TMC 765SP Streamer	85%	Matches: Bend, Shank, Wire, Eye Orient., Point +3 moreDiffers: Gap: Standard vs Wide; Eye: Tapered Eye vs Looped Eye; Finish: Bronzed vs Nickelled	Compare
	36717 No. 2 — Mustad 36717 Limerick	79%	Matches: Bend, Gap, Eye Orient., Point, Finish +2 moreDiffers: Shank: 4X Long vs Extra-Extra Long; Wire: Standard vs Extra-Heavy (2X+); Eye: Tapered Eye vs Ball Eye +1 more	Compare
	9661 No. 1, 2, 6, 8, 10, 12 — Mustad 9661	78%	Matches: Shank, Gap, Eye Orient., Point, Finish +2 moreDiffers: Wire: Standard vs Extra-Fine; Eye: Tapered Eye vs Ball Eye; Application: Wet Fly, Nymph, Streamer vs Nymph, Streamer	Compare
	3123 No. 3 — Mustad-Limerick Hook	76%	Matches: Bend, Wire, Gap, Eye Orient., Finish +3 moreDiffers: Shank: 4X Long vs 2X Long; Eye: Tapered Eye vs Ball Eye; Point: Hollow Point vs Superior	Compare
	36680 No. 6 — Mustad 36680 Streamer	74%	Matches: Bend, Shank, Gap, Eye, Eye Orient. +4 moreDiffers: Wire: Standard vs Heavy (1X Heavy); Application: Wet Fly, Nymph, Streamer vs Streamer, Salmon; Length: 46 mm vs 30 mm	Compare

ExploratoryRelated by Shape (SVG)

Ranked purely by silhouette geometry — attribute labels are ignored.

Silhouette	Hook Model	Match	Compare
	3191 A No. 2 — Mustad-Carlisle Hooks	99%	Compare
	3194 N No. 4, 6 — 3194 N	99%	Compare
	3785 No. 3/0 — Mustad 3785	99%	Compare
	3321 No. 6 — Carlisle	98%	Compare
	3192 No. t stamped on visible label (P) — Carlisle Hook	97%	Compare

Cross-reference & comparisons

Primary Application

The Mustad 3665A is a classic bait and light saltwater hook designed for live or cut bait fishing. The Limerick bend geometry provides excellent penetration and hook retention for species such as stripers, mackerel, and bottom-feeding fish. The straight eye and standard shank accommodate natural baits and simple soft-plastic presentations. The hollow point design cuts quickly through the bait into the fish’s mouth, reducing missed strikes.

Modern Equivalents

Collector notes

The 3665A is moderately collectible as a representative example of mid-20th-century North American tackle marketing and Norwegian hook manufacturing transferred to the US market. Original packaging significantly increases value; loose hooks of this model have little collector premium. Scarcity is modest — bulk boxes survive in greater numbers than individual vintage hooks, but original boxes from the early 1970s are uncommon.

Factors supporting collectability: Original Mustad/Key Brand packaging with intact label and printing is scarce and highly valued by tackle historians. The 3665A appears in fewer modern catalogs than larger Mustad sizes, increasing rarity among collectors seeking complete period assortments. The dual-language ‘MADE IN NORWAY’ marking appeals to Norwegian manufacturing history collectors. The handwritten price mark provides documentary evidence of retail economics from the early 1970s. The box’s condition — good but not pristine — is realistic and accessible to collectors with moderate budgets.

Limiting factors: The 3665A lacks notable design innovation or patent significance compared to branded specialty hooks. It is not the rarest Mustad model; far scarcer examples include early 1950s variants and discontinued specialty patterns. Loose hooks have minimal collector value outside the context of original packaging. The generic nature of the Limerick design means multiple manufacturers produced visually similar hooks, reducing exclusivity. Market demand is primarily from Mustad specialists and mid-century tackle historians, not mainstream hook collectors.

Packaging

Kraft cardboard box, approximately 4.5 x 3 inches, with blue and tan printed label. The label features the Mustad crown logo in red, the Key Brand key-in-circle logo in blue, and dual-language text 'MADE IN NORWAY / FABRIQUEE EN NORVEGE'. The main label panel includes printed fields for QUAL. (3665A), NO. (4), and QTY. (100), filled in by offset printing. A separate handwritten notation '72-' in graphite pencil appears on the lower left corner of the box, indicating a retailer price mark or inventory code. The box construction uses single-wall kraft with offset-printed text, typical of 1960s-1970s wholesale packaging. No Universal Product Code is present, confirming pre-1974 manufacture.

Market Value Notes

Pricing reflects original box condition and label clarity. A box in excellent condition with clean, unfaded label commands $25-$32. Good condition (light toning, minor wear) ranges $15-$22. Fair condition (heavy toning, label creasing, price marks) drops to $8-$15. Loose hooks individually are unsellable. Rarity premium applies for complete, unopened boxes with all 100 hooks intact. Prices are higher among UK and European collectors due to rarity of Mustad US subsidiary packaging in those markets.

Where to Find

Original 3665A boxes appear occasionally on eBay in collections of vintage tackle lots, typically priced $15-$35 depending on condition and box label quality. Specialist vintage tackle dealers (particularly those focused on Norwegian or American fishing heritage) stock them when available. Estate sales and antique fairs in regions with strong fishing traditions occasionally feature unopened or original-packaging boxes. Online forums dedicated to vintage fishhooks and tackle collecting report periodic sales through private channels. Loose hooks from broken packaging are effectively worthless and rarely listed separately.

Collector's Identification Tips

The model code 3665A is stamped on the kraft card label alongside the size number (4) and quantity (100). The Key Brand logo — a stylized key within a circle — appears in the upper right corner. The dual-language text ‘MADE IN NORWAY / FABRIQUEE EN NORVEGE’ confirms Norwegian manufacture. The Auburn, NY address distinguishes this as a US subsidiary product, not a direct Gjøvik import. Original packaging with handwritten price mark ’72-‘ in pencil indicates a retailer inventory code or price notation from the early 1970s.