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Mustad Hooks – 3101

3101 Limerick Hook hook silhouette
Hook Reference › O. Mustad & Son Hooks › Mustad Hooks – 3101

O. Mustad & Son 3101

3101 Limerick Hook1925 or later

Evidence reviewed October 14, 2026. Marks: P photographically · V verified · I inferred · E estimated · S speculative What they mean

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Summary

Mustad 3101 is a barbed, single-point hook made by O. Mustad & Sön of Norway. Its labels read “Qual. 3101”, “Superior” and “Mustad-Limerick Hooks” P.

Both labels print an Oslo address, which places them in 1925 or later I. No period catalog entry for the model has been located.

Photographic record

9 photographs

Mustad 3101 Limerick Hook — three specimens showing bend profiles — size 2 — bronzed finish
IMG-1Mustad 3101 Limerick Hook Size 2 Specimens Card with three taped hooks under a handwritten note reading 3101 2/0. The upper hook is gold-coloured; the lower two are dark grey-blue and show no eye.

How to identify it

Look for the Key Brand trademark, a skeleton key set between the words Key and Brand, inside a border of rosette ornaments P. The recorded labels print “O. MUSTAD & SÖN”, “OSLO – NORWAY”, “Qual. 3101”, “Superior”, “Mustad-Limerick Hooks”, “Ringed Bronzed” and “Made in Norway” P.

Two typesettings are recorded. One prints MANUFACTURERS in capitals; the other prints “Manufacturers” in mixed case. The size follows “No.” on the label.

Oslo became the city’s name on 1 January 1925, replacing Kristiania V. A label that prints it is therefore no earlier than 1925 I. On the hook, look for a ring eye in line with the shank and a barb cut from the inner face of the point P.

Technical profile and measurements

Features of the model, as recorded
FeatureRecordedEvidence
EyeBall Eye, Straight / Inline
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Closed ring eye in line with the shank, with a visible seam at the neck P. Both labels print 'Ringed'.

OBS-1OBS-8LBL-3LBL-9
WireStandard, Round, est. ~0.032-0.040" (~0.81-1.02 mm) (E)
Shank1X Long — Plain
BendLimerick, Standard gap
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Classic Limerick geometry with sharp angular transition at bend apex and extended point section P. Bend depth proportional to gap width P.

PointSuperior
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Barb cut from the inner face of the point as a short flag angled back toward the bend, with a V-shaped notch at its base P.

OBS-4OBS-11
FinishBronzed — stated on packaging
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Both labels print 'Bronzed'. Photographed hooks show a dark olive-brown finish with brass-coloured highlights P.

OBS-6OBS-13LBL-3LBL-9

The Superior point has a near-straight inner face running from the barb to the tip, and a gently concave outer edge P. Fine diagonal cross-hatch tool marks show on the flank of the point at sizes 2 and 9/0 P.

The shank is plain, straight and round, with no kink, bend or knurling, a textured band cut into the wire P. Compared with other hooks traced for this reference, the shank proportion falls nearest the 1X long group, meaning a shank about as long as that of the next larger size, and the wire thickness falls nearest standard I.

No label states shank length, wire gauge or gap P. The photographs carry no stated grid scale, so no dimensions are derived from them.

Measurements

Per size, with how each dimension was taken
SizeOverall lengthShank lengthGap widthBend depthWire diameterWeightShank:gap
9/0Specimen S2———————
2Specimen S1———————
4Catalog record22.6 mm Vgrid photo12.7 mm Vgrid photo16.5 mm E Vgrid photo8.6 mm Vgrid photo——~1.8-2.0 : 1
6Catalog record19.1 mm V10.7 mm V—6.6 mm V0.8 mm V——
8Catalog record15.8 mm V8.4 mm V—6.1 mm V0.7 mm V——
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 3 specimens. Each describes itself only; none stands for every example of the model.

Cardboard box with a green Key Brand label printed Qual. 3101, Superior, Mustad-Limerick Hooks, Ringed Bronzed, 100 and No. 2.
Open full size

S1 · Box of size 2

Size
2 (printed on the label)
Container
Box
Hook condition
No rust or pitting is visible on the photographed hooks; fine surface scratches only (P).
Packaging condition
Good — moderate wear, legible
Wear
label, margins and corners: Label surface crazed and cracked, with olive-brown staining along all four margins, heaviest at the top and left; the last digit of 3101 is partly marred by a crease. Printed text stays legible. LBL-6
Measured
size 2
Photographs
IMG-3IMG-4IMG-5IMG-6

Label crazed and cracked, with olive-brown staining on all four margins and a crease across the last digit of 3101; printed text stays legible P. Box edges are toned. The size comes from the label. The hook photographs are assigned to this box as probable matches; none shows hooks in the box.

What the label says

LBL-1 trademark · label, left column from IMG-3
Key
Brand
LBL-2 printed · label, top centre from IMG-3
O. MUSTAD & SÖN
MANUFACTURERS
OSLO - NORWAY
LBL-3 printed · label, centre from IMG-3
Qual. 3101
Superior
Mustad-Limerick Hooks
Ringed Bronzed
LBL-4 printed · label, lower left from IMG-3
100
No. 2
LBL-5 printed · label, lower right from IMG-3
Made in Norway
Trademark
Skeleton-key illustration with an ornate bow, set between the words Key and Brand in the left column. A border of repeated rosette or asterisk ornaments runs round the label.
As entered on the specimen record
Key
Brand
O. MUSTAD & SÖN
MANUFACTURERS
OSLO - NORWAY
Qual. 3101
Superior
Mustad-Limerick Hooks
Ringed Bronzed
100
No. 2
Made in Norway
Layout
Key Brand trademark in the left column. Maker, address, quality number, Superior, pattern name and Ringed Bronzed centred. 100 and No. 2 at lower left; Made in Norway at lower right. Rosette border all round.
Typeface
MANUFACTURERS in capitals; 'Qual.' in a serif face; short dash in OSLO - NORWAY. The numeral 2 is in a larger serif face, offset from 'No.'.
Green Key Brand label on a torn card scrap, printed Qual. 3101, with 9/0 handwritten over No. and 30 written beside a struck-through 100.
Open full size

S2 · Size 9/0 label on card scrap

Size
9/0 (printed on the label)
Container
Card
Hook condition
Small reddish-brown specks near the eye end of the shank and a worn brass-coloured band along the top of the shank and bend; no heavy corrosion visible elsewhere (P).
Packaging condition
Fair — significant wear, partially legible
Wear
label upper left, left third, right margin, card edges: Upper-left corner of the green label torn away with border ornaments missing; creases down the left third; dark green smears along the right margin; small black wedge-shaped mark at the right edge; tan card scrap has uneven torn edges. LBL-15
Measured
size 9/0
Photographs
IMG-7IMG-8IMG-9

The green label is mounted on a tan card scrap with uneven torn edges. The upper-left corner of the label is torn away with border ornaments missing; creases run down the left third; dark green smears lie along the right margin; a small black wedge-shaped mark sits at the right edge P. The size is entered by hand. The hook photographs are assigned as probable matches.

What the label says

LBL-7 trademark · label, upper left from IMG-9
Key
Brand
LBL-8 printed · label, top centre from IMG-9
O. MUSTAD & SÖN
Manufacturers
OSLO — NORWAY
LBL-9 printed · label, centre from IMG-9
Qual. 3101
Superior
Mustad-Limerick Hooks
Ringed Bronzed
LBL-10 printed · label, lower left from IMG-9
100
No.
LBL-11 printed · label, lower right from IMG-9
Made in Norway
LBL-12 handwritten · label, lower left, beside printed 100 from IMG-9
30
LBL-13 handwritten · label, lower left, across printed 100 from IMG-9
strike-through line across the printed 100
LBL-14 handwritten · label, lower left, written over the printed No. from IMG-9
9/0
Trademark
Skeleton-key illustration with an ornate bow between the words Key and Brand, left side of the label; rosette or asterisk ornament border, partly missing at the upper left.
As entered on the specimen record
Key
Brand
O. MUSTAD & SÖN
Manufacturers
OSLO — NORWAY
Qual. 3101
Superior
Mustad-Limerick Hooks
Ringed Bronzed
100
No.
Made in Norway
Layout
Key Brand trademark at upper left. Maker block at top centre. Quality number, Superior, pattern name and Ringed Bronzed at centre. 100 and No. at lower left; Made in Norway at lower right. Rosette border, partly missing at the upper left.
Typeface
'Manufacturers' in mixed case; 'Qual.' in a bold sans-serif face; long dash in OSLO — NORWAY.
Later marks
30 beside the printed 100, which is struck through by a handwritten line
9/0 written over the printed No.
Handwritten note to Charlie with two taped groups of three hooks, labelled 3391 2/0 on the left and 3101 2/0 on the right.
Open full size
Three hooks taped to a card beneath red handwriting reading 3101 2/0: one gold-coloured, two dark grey-blue with tapered shanks and no visible eye.
Open full size

S3 · Handwritten card with taped hooks

Size
2/0 (unknown)
Container
Card
Hook condition
Hooks lie flat under clear tape or plastic, which blurs parts of the hooks; fibres are trapped beside the middle hook (P).
Wear
card, hook rows and note lines: Clear tape or plastic strips cross the card over the hooks and over part of the 3101 note. Red ink bleeds into pink halos around the writing. The 7111 B line is blurred. Fibres are trapped beside the middle hook. LBL-24
Photographs
IMG-1IMG-2

Two taped groups of three hooks sit under red-ink notes naming 3391 2/0 (left) and 3101 2/0 (right). In the 3101 group the upper hook is gold-coloured and the two lower hooks are dark grey-blue P. The upper hook ends in a small round eye or bead; the lower two have shanks tapering to a fine point with no visible eye P. All three have barbed points. Only the handwriting links these hooks to the 3101, and the size written is 2/0.

What the label says

LBL-16 handwritten · card, top left, above the letter text from IMG-2
Dear Charlie
LBL-17 handwritten · card, upper body, three lines from IMG-2
That's what my friend the 'goldsmith' does
with the hooks you sended me once (he does them
in series of 10 or 12 hooks (but it takes a little time)
LBL-18 handwritten · card, above the left hook group from IMG-2
Those Mustad(s) Sprouts 3391 2/0
LBL-19 handwritten · card, above the right hook group from IMG-1IMG-2
Those (Mustad's) 3101
2/0
LBL-20 handwritten · card, right group, line below the 3101 note, partly smeared from IMG-1IMG-2
[?]ut he did then t[?][?] with 7111 B
LBL-21 handwritten · card, bottom left, below the left hook group, last line cut by image edge from IMG-2
good for 'mixed' wings
a set of 1/0 with wide ga[?]e
LBL-22 handwritten · card, bottom right, below the right hook group, cut by image edge from IMG-1IMG-2
good for 'Teno Seri[?]
or Cat of FLOW or DEE's
Spe[?]'
LBL-23 handwritten · card, beside the 3391 and 3101 notes and above the lower-right note from IMG-1IMG-2
red ink arrows: one under the 3391 note pointing down-left at the first hook's eye; one beside the 3101 note pointing down-right toward the 7111 B line; one above the lower-right note pointing left
As entered on the specimen record
Layout
Red-ink letter lines across the top, then two taped groups of three hooks. Each group has a note above it and a further note below it.
Later marks
Dear Charlie
That's what my friend the 'goldsmith' does
with the hooks you sended me once (he does them
in series of 10 or 12 hooks (but it takes a little time)
Those Mustad(s) Sprouts 3391 2/0
Those (Mustad's) 3101
2/0
[?]ut he did then t[?][?] with 7111 B
good for 'mixed' wings
a set of 1/0 with wide ga[?]e
good for 'Teno Seri[?]
or Cat of FLOW or DEE's
Spe[?]'
Red ink arrows run beside the notes.

Condition

No heavy corrosion is visible on the photographed size 2 and 9/0 hooks P.

Pattern history and manufacturer context

Series

The 3101 is documented here in sizes 2 and 9/0 P. No catalog, price list or collector reference for the model has been located, so its introduction year, production run and end date are undocumented.

Dating

Both labels print OSLO. Oslo became the city's name on 1 January 1925 V, so labels that print it date to 1925 or later I. Neither label carries a barcode P. No dated source for the end of this packaging has been located.

O. Mustad & Son — A factory was established at Gjøvik in 1832 by Hans Skikkelstad. Ole Hovelsen Mustad later took it over and renamed it O. Mustad & Søn. Mustad's hook-making machine was ready in 1877 V. Read the maker’s history →
Share of World Hook Production. By Mustad's own account, the company made 50% of global hook production in the 1950s V.

Use

Primary application

The labels state no intended use, and no period catalog entry for the 3101 has been located. Its historical application is therefore undocumented P.

Collecting and buying

4 / 10CollectabilityRarity: Uncommon

Two sizes and two Key Brand label typesettings are documented; no recorded sale, catalog listing or count of surviving examples is available to place the model higher or lower.

The 3101 is documented through two Key Brand label typesettings and two sizes, 2 and 9/0 P.

No recorded sale, catalog listing or count of surviving examples is available. The page therefore gives no scarcity figure beyond the rating.

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.

No sold results are recorded for the 3101, so no value range is established.

Where to find

eBay, vintage tackle shows, estate sales, old tackle boxes

Modern equivalents and related hooks

Modern equivalents
HookMatchNotes
Mustad 31010GoodCurrent Mustad Limerick with a ringed in-line eye and a 1X long shank V. It is finished in Duratin rather than bronzed and is listed in sizes 1/0 to 7/0 only.
Mustad 3366ModerateSproat bend with a straight shank, ringed in-line eye and bronze finish V. The bend differs from the Limerick named on the 3101 labels, and the page gives no wire descriptor.
Daiichi 2141ModerateLimerick bend with a straight tapered-loop eye, 1X-heavy wire and black finish V. The eye, wire and finish differ from the 3101.

Best matchRelated by Attribute

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

SilhouetteHook ModelMatchAnalysisCompare
3101 A No. 2/0 — 3101 A silhouette3101 A No. 2/0 — 3101 A98%Matches: Bend, Shank, Wire, Gap, Eye +7 moreCompare
3100 No. 5/0 — Mustad-Limerick Hooks silhouette3100 No. 5/0 — Mustad-Limerick Hooks95%Matches: Bend, Shank, Wire, Gap, Eye +6 moreDiffers: Finish: Bronzed vs Black JapannedCompare
31010 ST No. 3/0 — Mustad-Atlantic Limerick Hook silhouette31010 ST No. 3/0 — Mustad-Atlantic Limerick Hook93%Matches: Bend, Shank, Wire, Gap, Eye +6 moreDiffers: Finish: Bronzed vs TinnedCompare
3103 No. 4 — Mustad-Limerick Hooks silhouette3103 No. 4 — Mustad-Limerick Hooks88%Matches: Bend, Shank, Gap, Eye, Eye Orient. +5 moreDiffers: Wire: Standard vs Heavy (1X Heavy); Finish: Bronzed vs TinnedCompare
4707 No. 4/0 — 4707 silhouette4707 No. 4/0 — 470788%Matches: Bend, Shank, Wire, Gap, Eye +6 moreDiffers: Point: Superior vs Hollow PointCompare

ExploratoryRelated by Shape (SVG)

Ranked purely by silhouette geometry — attribute labels are ignored.

SilhouetteHook ModelMatchCompare
3101 A No. 2/0 — 3101 A silhouette3101 A No. 2/0 — 3101 A83%Compare
3100 A No. 2, 10 — Mustad-Limerick silhouette3100 A No. 2, 10 — Mustad-Limerick80%Compare
8210 No. 5 — Mustad 8210 silhouette8210 No. 5 — Mustad 821080%Compare
7111 B No. 2/0, 6/0 — Mustad 7111B Limerick silhouette7111 B No. 2/0, 6/0 — Mustad 7111B Limerick79%Compare
3813 No. 6/0 (V) — Mustad 3813 O'Shaughnessy silhouette3813 No. 6/0 (V) — Mustad 3813 O'Shaughnessy77%Compare

Sources, open questions, and record notes

Sources & Documentation

This specimen and its packaging — photographed, 9 images
Supports: quantity per packagesize documentedeyebarbfinishcondition notesdating rangepackaginghook type applicationsecondary applicationsfly patternsraritycollectability summarymeta descriptionsummarytechnical notesidentificationseries historyprimary applicationcollectability detail

Entry last updated September 14, 2026. Entries are updated as new specimens, measurements, or documents come to light.