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Seiko watch · 5 Sports · automatic

Seiko SSK003

The Seiko SSK003 measures 42.5 mm across, 46 mm lug to lug, and 13.6 mm thick, with 22 mm lugs. It fits wrists from ~16.5 cm (flat-fit estimate).

Sources checked · How we source numbers
Case
42.5 mm1
Lug to lug
46 mm1
Thickness
13.6 mm1
Lug width
22 mm1
Seiko SSK003: size drawingSeiko SSK003, round case, top and side view to scale: case diameter 42.5 mm, lug to lug 46 mm, lug width 22 mm, thickness 13.6 mm, rotating bezel. Bezel, dial and crown size are schematic.lug width 22Ø 42.5lug to lug 46TOPthickness 13.6SIDE
Seiko SSK003, top and side, to scaleDrawing from data, not a photo · mm

Seiko SSK003 specifications

Case diameter
42.5 mm1
Lug to lug
46 mm1
Thickness
13.6 mm1
Lug width
22 mm122 mm watches
Weight
161 g1
Crystal
Hardlex with magnified glass1
Water resistance
10 bar (100 m)1
Movement
Seiko 4R341 · automaticSeiko 4R34 specs
Battery
none: the Seiko 4R34 is automatic
Years made
start not published
Case code
not in our data yet
Bezel
rotating1
Line
5 Sports1

On your wrist

The verdict compares the lug to lug with the flat top of your wrist. Balanced from ~16.5 cm, past the edges below ~14.5 cm.

= 6.7 in

Balanced on a 17 cm wrist: the 46 mm lug to lug covers 84% of an estimated 54.8 mm flat top.

Flat top = circumference ÷ 3.1, a community convention, not a measurement of your arm. Compact ≤ 0.75 of the flat top, balanced ≤ 0.89, at the edge ≤ 1. Compare more watches in the watch size calculator.

Seiko SSK003: wrist fitSeiko SSK003 on a wrist, top view to scale. lug to lug 46 mm. Wrist 170 mm, estimated flat width 54.8 mm (circumference / 3.1). Ratio 0.84: balanced.wrist, flat topwrist flat ≈ 54.8lug to lug 46Balanced · 46 / 54.8 = 0.84estimate: wrist 170 / 3.1 = 54.8 flatcompactbalancededgeoverhang0.750.891
Seiko SSK003 on a 17 cm wristDrawing from data, not a photo · mm

Actual size on your screen

Calibrate once with a bank card and the drawing shows the Seiko SSK003 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SSK003: size drawingSeiko SSK003, round case, top and side view to scale: case diameter 42.5 mm, lug to lug 46 mm, lug width 22 mm, thickness 13.6 mm, rotating bezel. Bezel, dial and crown size are schematic.lug width 22Ø 42.5lug to lug 46TOPthickness 13.6SIDE
Drawing from data, not a photo · mm
01020304050

Seiko SSK003 strap size

Lug width 22 mm1: a 22 mm strap with 22 mm spring bars fits between the lugs. 45 other models take 22 mm.

Attachment: not published in our sources.

Find your strap length in the watch strap size tool, with the Seiko SSK003 filled in.

On a bracelet? How to remove watch links to size it to your wrist.

22 mm strap: strap diagramTwo-piece strap laid flat (22 mm strap). Lug width 22 mm. Short piece — (unknown), long piece — (unknown). Buckle, keepers and holes are schematic.short —long —lug 22lug 22strap length —22 mm strap
22 mm at the lugs; lengths depend on your wristDrawing from data, not a photo · mm

Movement: Seiko 4R34

The Seiko SSK003 runs on the Seiko 4R34, an automatic movement. 4 other models in our base use it.

Beat rate
21,600 bph2
Power reserve
41 h2
Jewels
242
Accuracy
−35 to +45 s/day2
Hacking seconds
Yes2
Hand winding
Yes2

Battery

none: the Seiko 4R34 is automatic

A mechanical watch has no cell to replace; it needs a service instead.

Same size as the Seiko SSK003

The models nearest to the Seiko SSK003 in case width and lug to lug, drawn over it to scale; below, every model within 1 mm of its 46 mm.

Size comparison: Seiko SSK003, Seiko SSC957, Islander ISL-94, Seiko SARX055Top-view outlines to scale on one centre. A Seiko SSK003: Ø 42.5, L2L 46, lug 22, T 13.6. B Seiko SSC957: Ø 41.4, L2L 45.9, lug 21, T 13 (vs A: Ø −1.1 L2L −0.1 lug −1 T −0.6). C Islander ISL-94: Ø 42, L2L 47, lug —, T 13 (vs A: Ø −0.5 L2L +1 T −0.6). D Seiko SARX055: Ø 40.8, L2L 46.2, lug —, T 11 (vs A: Ø −1.7 L2L +0.2 T −2.6).D Ø 40.8B Ø 41.4C Ø 42A Ø 42.5B L2L 45.9A L2L 46D L2L 46.2C L2L 47A Seiko SSK003Ø 42.5 · L2L 46 · lug 22 · T 13.6B Seiko SSC957Ø 41.4 · L2L 45.9 · lug 21 · T 13vs A: Ø −1.1 L2L −0.1 lug −1 T −0.6C Islander ISL-94Ø 42 · L2L 47 · lug — · T 13vs A: Ø −0.5 L2L +1 T −0.6D Seiko SARX055Ø 40.8 · L2L 46.2 · lug — · T 11vs A: Ø −1.7 L2L +0.2 T −2.6
A Seiko SSK003 and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ASeiko SSK003this watch
  2. BSeiko SSC957W −1.1 · L2L −0.1 · T −0.6 mm
  3. CIslander ISL-94W −0.5 · L2L +1 · T −0.6 mm
  4. DSeiko SARX055W −1.7 · L2L +0.2 · T −2.6 mm

Differences against A in mm: W case width, L2L lug to lug, T thickness. Nearest by width and length together, from the published sizes.

Same published case dimensions (2)Seiko SSK001, Seiko SSK005

Same movement: Seiko 4R34

Parts documented for the Seiko SSK003

5 claims for named aftermarket parts are in the catalogue. Each claim is tied to this exact model and its seller’s source.

Seiko SSK003 questions

How big is the Seiko SSK003?

The Seiko SSK003 measures 42.5 mm across, 46 mm lug to lug, 13.6 mm thick, 161 g.

Will the Seiko SSK003 fit a 6.5-inch wrist?

Balanced: the Seiko SSK003's 46 mm lug to lug takes 86% of the ~53.3 mm flat top of a 6.5-inch (16.5 cm) wrist. By the same estimate (circumference ÷ 3.1) it sits balanced from about 16.5 cm and overhangs the flat top on wrists under about 14.5 cm.

Does the Seiko SSK003 need a battery?

No. The Seiko SSK003 has no cell to replace: a wound mainspring drives its automatic Seiko 4R34.

What movement is in the Seiko SSK003?

The Seiko SSK003 runs on the Seiko 4R34, an automatic movement.

What strap size does the Seiko SSK003 take?

The Seiko SSK003 measures 22 mm between the lugs, so it takes a 22 mm strap with 22 mm spring bars. 45 other models in our base share that width.

Find the strap length for your wrist and the Seiko SSK003 in the watch strap size tool.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — SSK003 product page (us-en), seikowatches.com · html · read
  2. 2Seiko Watch Corporation — Mechanical watch instructions, Cal. 4R34 (EN) · pdf · read
  3. 3CaliberCorner — Seiko Caliber 4R34 watch movement page · html · read