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Mustad Hooks – 3913 A

Mustad 3913 A hook silhouette
Hook Reference › O. Mustad & Son Hooks › Mustad Hooks – 3913 A

O. Mustad & Son 3913 A

Mustad 3913 A1925 or later; exact production period unestablished

Evidence reviewed October 23, 2026. Marks: P photographically · V verified · I inferred · E estimated · S speculative What they mean

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Summary

Surviving Key Brand boxes identify the Mustad 3913 A as a Norwegian-made Mustad-Sproat pattern P. The Oslo address establishes a package date of 1925 or later, but the model’s full production period remains unestablished V.

Photographic record

8 photographs

Mustad 3913 A Sproat Hook — packaging label and box — size 3 — vintage Oslo Norway label with gold foil border
IMG-1Mustad 3913 A Size 3 Box and Label Front of a Mustad 3913 A size 3 box. The label identifies Mustad-Sproat Hooks, Hollow Point, turned-up tapered eye, 2 ex. long shank, Reversed, Wide gape, and Bronzed finish; tape and staining are visible.

How to identify it

Identify the model by Qual. 3913 A and Mustad-Sproat Hooks on the lid label. Both documented boxes also state Hollow Point, a turned-up tapered eye, Bronzed, 2 ex. long shank, Reversed, and Wide gape or Wide gap P.

The No. 3 label uses “tap.” and “Wide gape.” The No. 10 label uses “tapered” and “Wide gap” P.

Technical profile and measurements

Features of the model, as recorded
FeatureRecordedEvidence
EyeTapered Eye, Turned Up
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Up-turned formed eye; the terminal wire visibly narrows into the oval loop on both photographed specimens P.

OBS-1OBS-8
WireFine (1X Fine), RoundCMP-3IMG-3IMG-7CMP-3 compared with 125 catalogued hooks classified Fine (1X Fine)
Shank2X Long — PlainCMP-1LBL-1LBL-6OBS-5OBS-12CMP-1 compared with 77 catalogued hooks classified 2X Long
BendSproat, Wide gap, Offset / kirbed
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Silhouette comparison places the traced bend nearest Carlisle; the packaging names the pattern Mustad-Sproat.

LBL-1LBL-6
PointHollow Point
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A single prominent barb is visible on the inner side of the point on both photographed specimens P.

LBL-1LBL-6OBS-3OBS-10OBS-4OBS-11
FinishBronzed — stated on packaging
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Both labels specify Bronzed; the hooks show a dark bronze-brown finish with localized brighter wear P.

LBL-1LBL-6OBS-6OBS-13

Point: Both labels state Hollow Point. Photographs show a long tapered point, a concave or ground inner face, and one prominent barb P.

Eye and shank: The labels specify a turned-up tapered eye and 2 ex. long shank. Photographs show the wire narrowing into the oval eye and a long, straight, plain shank P.

Bend: The packaging names the pattern Mustad-Sproat, while the platform silhouette comparison places the bend nearest Carlisle (CMP-2). Both boxes state Reversed; under the site’s terminology this denotes a point offset to the right when viewed from the eye, although the amount is not photographically established.

Wire: The platform comparison places wire thickness nearest Fine (1X Fine) (CMP-3). Cross-section and diameter remain unmeasured.

Measurements

Per size, with how each dimension was taken
SizeOverall lengthShank lengthGap widthBend depthWire diameterWeight
3Specimen S137.1 mm PcaliperMEA-1—9.4 mm PcaliperMEA-2———
Calibrated SVG True-scale preview

How hook dimensions are measuredA hook outline with dimension lines for overall length, shank length, gap, bend depth, and wire diameter.Overall lengthShank lengthGapBend depthWire diameter
Overall length
Eye to the farthest point of the bend.
Shank length
Eye to the start of the bend.
Gap
Point to shank, at right angles to the shank.
Bend depth
Shank to the bottom of the bend.
Wire diameter
Across the wire, measured by caliper where possible.

Specimens, packaging, and label

This record documents 2 specimens. Each describes itself only; none stands for every example of the model.

Mustad 3913 A Key Brand box, size 3, with cream label, gold starburst border, and handwritten size mark.
Open full size

S1 · Box and hooks, size 3

Size
3 (printed on the label)
Container
Box
Hook condition
Intact; closed eye, point and barb present; minor wear or patina; no obvious heavy corrosion.
Packaging condition
Fair — significant wear, partially legible
Wear
lid label and box edges: Clear tape crosses upper-left and center; staining/soil, abrasions, edge wear, and small tears are visible. LBL-5
Measured
size 3
Photographs
IMG-1IMG-2IMG-3IMG-4

What the label says

LBL-1 printed · lid label, center and right from IMG-1
O. MUSTAD & SÖN
Manufacturers
OSLO - NORWAY
Qual. 3913 A
Hollow Point
Mustad-Sproat Hooks
T. up tap. eye Bronzed
2 ex. long shank
Reversed Wide gape
Made in Norway
LBL-2 trademark · lid label, upper left from IMG-1
Ke[?]
Brand
LBL-3 printed · lid label, lower left from IMG-1
100
No.
LBL-4 handwritten · lid label, lower left beside No. from IMG-1
3
Trademark
Skeleton-key emblem; the final character of the word above Brand is obscured by tape.
As entered on the specimen record
Ke[?]
Brand
O. MUSTAD & SÖN
Manufacturers
OSLO - NORWAY
Qual. 3913 A
Hollow Point
Mustad-Sproat Hooks
T. up tap. eye Bronzed
2 ex. long shank
Reversed Wide gape
100
No.
Made in Norway
Layout
Gold-colored starburst border around a cream lid label; key emblem at upper left; principal product text centered and right; quantity and No. at lower left.
Typeface
The word “Manufacturers” is mixed case. Product and specification lines use a mixture of uppercase and title-style lettering.
Printed marks
100; No.
Later marks
3
Mustad 3913 A Key Brand box, size 10, with cream label, gold starburst border, and handwritten size mark.
Open full size

S2 · Box and hooks, size 10

Size
10 (printed on the label)
Container
Box
Hook condition
Intact; closed eye, point and barb present; minor wear or patina; no obvious heavy corrosion.
Packaging condition
Very Good — light wear, fully legible
Wear
lid label and box edges: Minor edge wear and light toning; label remains largely intact and legible. LBL-10
Photographs
IMG-5IMG-6IMG-7IMG-8

What the label says

LBL-6 printed · lid label, center and right from IMG-5
O. MUSTAD & SÖN
MANUFACTURERS
OSLO - NORWAY
Qual. 3913 A
Hollow Point
Mustad-Sproat Hooks
T. up tapered eye Bronzed
2 ex. long shank Reversed
Wide gap
Made in Norway
LBL-7 trademark · lid label, upper left from IMG-5
Key
Brand
LBL-8 printed · lid label, lower left from IMG-5
100
No.
LBL-9 handwritten · lid label, lower left beside No. from IMG-5
10
Trademark
Skeleton-key emblem between Key and Brand.
As entered on the specimen record
Key
Brand
O. MUSTAD & SÖN
MANUFACTURERS
OSLO - NORWAY
Qual. 3913 A
Hollow Point
Mustad-Sproat Hooks
T. up tapered eye Bronzed
2 ex. long shank Reversed
Wide gap
100
No.
Made in Norway
Layout
Gold-colored starburst border around a cream lid label; key emblem at upper left; principal product text centered and right; quantity and No. at lower left.
Typeface
MANUFACTURERS is uppercase. The wording and line arrangement differ from the documented size 3 label.
Printed marks
100; No.
Later marks
10

Condition

Both photographed hooks are intact with minor wear or patina. The No. 3 box is fair with tape and staining; the No. 10 box is very good.

Pattern history and manufacturer context

Series

Both documented boxes use Mustad-Sproat Hooks and Qual. 3913 A P. They state the same principal construction but differ in wording and line arrangement, documenting at least two packaging variants for the model.

Design lineage

No direct predecessor or successor for the 3913 A is established by the checked evidence. Mustad’s published S82AP history traces that modern 2X-long Sproat hook through the 3906B and S82NP designations rather than through the 3913 A V.

Dating

Both documented boxes read OSLO - NORWAY. Oslo became the official city name on January 1, 1925, establishing a 1925-or-later terminus for these packages V. No dated 3913 A catalog or authoritative packaging chronology has yet narrowed the production period.

O. Mustad & Son Read the maker’s history →

Use

Primary application

No model-specific historical application is established by the checked evidence. The surviving 3913 A labels do not name a fly type, target species, or fishing use.

Collecting and buying

4 / 10CollectabilityRarity: Uncommon

Two boxed sizes are documented, but the checked evidence does not establish model-wide scarcity or collector demand.

Two original boxed specimens are documented in sizes No. 3 and No. 10 P. Their labels differ in wording and layout while carrying the same 3913 A designation.

The checked source findings contain no recorded sold observations. Model-wide scarcity and collector demand therefore remain unestablished from the available evidence.

Market value

Insufficient recorded sales data to estimate a reliable value.

0 sold observations recorded; 2 are needed, with the basis and date of the range, before a value is shown. Asking prices are shown as asking prices only.

The checked source findings contain no recorded sold observations supporting a current value range.

Where to find

Search for Mustad 3913 A, Mustad 3913A, and Mustad-Sproat Hooks.

Modern equivalents and related hooks

Modern equivalents
HookMatchNotes
Mustad Heritage S82APModerateFunctional comparison only I. Mustad describes the S82AP as a 2X-long Sproat hook with a down-turned ringed eye, inline configuration, and TitanX finish, and traces it through 3906B and S82NP rather than through 3913 A V.

Best matchRelated by Attribute

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

SilhouetteHook ModelMatchAnalysisCompare
38933 No. 8, 10 — Mustad 38933 silhouette38933 No. 8, 10 — Mustad 3893392%Matches: Bend, Wire, Eye, Eye Orient., Point +4 moreDiffers: Gap ratio: 25.3% vs 24.7%Compare
2055 No. 3 — Alec Jackson 2055 Spey Fly Hook silhouette2055 No. 3 — Alec Jackson 2055 Spey Fly Hook79%Matches: Bend, Shank, Wire, Gap, Eye Orient. +3 moreDiffers: Eye: Tapered Eye vs Looped Eye; Point: Hollow Point vs Needle; Finish: Bronzed vs Gold-Plated +1 moreCompare
3906B No. 1, No. 4 and No. 18 — Mustad 3906B silhouette3906B No. 1, No. 4 and No. 18 — Mustad 3906B75%Matches: Bend, Wire, Eye, Point, Finish +3 moreDiffers: Shank: 2X Long vs 1X Long; Gap: Wide vs Standard; Eye Orient.: Turned Up vs Turned Down +2 moreCompare
3908 A No. 2 — Mustad 3908 A silhouette3908 A No. 2 — Mustad 3908 A75%Matches: Bend, Shank, Eye, Point, Finish +3 moreDiffers: Wire: Fine (1X Fine) vs Standard; Gap: Wide vs Standard; Eye Orient.: Turned Up vs Turned Down +2 moreCompare
7974 No. 6, 8, 10, 12, 14; sixth handwritten mark 1[?] — Mustad 797475%Matches: Eye, Eye Orient., Point, Finish, Offset +2 moreDiffers: Bend: Sproat vs Viking; Forging: Round vs ForgedCompare

ExploratoryRelated by Shape (SVG)

Ranked purely by silhouette geometry — attribute labels are ignored.

SilhouetteHook ModelMatchCompare
7110 E — Mustad 7110 E silhouette7110 E — Mustad 7110 E78%Compare
3404 E No. 3/0 — Mustad 3404 E silhouette3404 E No. 3/0 — Mustad 3404 E78%Compare
N No. 1/0 — Code N Single Low Water silhouetteN No. 1/0 — Code N Single Low Water71%Compare
100 No. 8 — Wright & McGill Model 100 silhouette100 No. 8 — Wright & McGill Model 10071%Compare
9049 No. 2–8 — Mustad 9049 silhouette9049 No. 2–8 — Mustad 904970%Compare

Sources, open questions, and record notes

Sources & Documentation

This specimen and its packaging — photographed, 8 images
Supports: sub brandhook type applicationsize documentedquantity per packageconstructionwireshankpointfinishgapoffset kirbedeyebarbcondition notesmeasurement notesmeasurements availablemeasurement methodsize measuredoverall lengthshank lengthgap widthbend depthshank gap ratiodating rangepackagingsecondary applicationsfly patternscollectability summaryfun fact titlefun factwhere to findmeta titlemeta descriptionprimary search termssummaryidentificationtechnical notesseries historyprimary applicationcollectability detail

Open questions

  1. What are the earliest and latest dated Mustad catalogs or price lists that list Quality 3913 A?No dated manufacturer catalog or price list containing 3913 A has been located.Can you help? Please send a dated Mustad catalog or price-list page that shows 3913 A, including the publication date and page number.
  2. What historical fishing or fly-tying applications did Mustad specify for the 3913 A?The surviving labels describe construction but do not name a fly type, fish species, or intended use.Can you help? Please send a Mustad catalog, advertisement, dealer list, or period tying reference that names an application for Quality 3913 A.

Entry last updated September 10, 2026. Entries are updated as new specimens, measurements, or documents come to light.