Skip to content
WatchtheDetails

Seiko watch · 5 Sports · automatic

Seiko SSK059

The Seiko SSK059 measures 39.4 mm across, 47.9 mm lug to lug, and 13.6 mm thick, with 20 mm lugs. It fits wrists from ~17 cm (flat-fit estimate).

Sources checked · How we source numbers
Case
39.4 mm1
Lug to lug
47.9 mm1
Thickness
13.6 mm1
Lug width
20 mm1
Seiko SSK059: size drawingSeiko SSK059, round case, top and side view to scale: case diameter 39.4 mm, lug to lug 47.9 mm, lug width 20 mm, thickness 13.6 mm. Bezel, dial and crown size are schematic.lug width 20Ø 39.4lug to lug 47.9TOPthickness 13.6SIDE
Seiko SSK059, top and side, to scaleDrawing from data, not a photo · mm

Seiko SSK059 specifications

Case diameter
39.4 mm1
Lug to lug
47.9 mm1
Thickness
13.6 mm1
Lug width
20 mm120 mm watches
Weight
147 g1
Crystal
Curved Hardlex1
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
Line
5 Sports1

On your wrist

The verdict compares the lug to lug with the flat top of your wrist. Balanced from ~17 cm, past the edges below ~15 cm.

= 6.7 in

Balanced on a 17 cm wrist: the 47.9 mm lug to lug covers 87% 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 SSK059: wrist fitSeiko SSK059 on a wrist, top view to scale. lug to lug 47.9 mm. Wrist 170 mm, estimated flat width 54.8 mm (circumference / 3.1). Ratio 0.87: balanced.wrist, flat topwrist flat ≈ 54.8lug to lug 47.9Balanced · 47.9 / 54.8 = 0.87estimate: wrist 170 / 3.1 = 54.8 flatcompactbalancededgeoverhang0.750.891
Seiko SSK059 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 SSK059 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SSK059: size drawingSeiko SSK059, round case, top and side view to scale: case diameter 39.4 mm, lug to lug 47.9 mm, lug width 20 mm, thickness 13.6 mm. Bezel, dial and crown size are schematic.lug width 20Ø 39.4lug to lug 47.9TOPthickness 13.6SIDE
Drawing from data, not a photo · mm
01020304050

Seiko SSK059 strap size

Lug width 20 mm1: a 20 mm strap with 20 mm spring bars fits between the lugs. 62 other models take 20 mm.

Attachment: not published in our sources.

Find your strap length in the watch strap size tool, with the Seiko SSK059 filled in.

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

20 mm strap: strap diagramTwo-piece strap laid flat (20 mm strap). Lug width 20 mm. Short piece — (unknown), long piece — (unknown). Buckle, keepers and holes are schematic.short —long —lug 20lug 20strap length —20 mm strap
20 mm at the lugs; lengths depend on your wristDrawing from data, not a photo · mm

Movement: Seiko 4R34

The Seiko SSK059 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 SSK059

The models nearest to the Seiko SSK059 in case width and lug to lug, drawn over it to scale; below, every model within 1 mm of its 47.9 mm.

Size comparison: Seiko SSK059, Seiko SRPG27, Seiko SRPG29, Seiko SRPG31Top-view outlines to scale on one centre. A Seiko SSK059: Ø 39.4, L2L 47.9, lug 20, T 13.6. B Seiko SRPG27: Ø 39.4, L2L 48.1, lug 20, T 13.2 (vs A: Ø 0 L2L +0.2 lug 0 T −0.4). C Seiko SRPG29: Ø 39.4, L2L 48.1, lug 20, T 13.2 (vs A: Ø 0 L2L +0.2 lug 0 T −0.4). D Seiko SRPG31: Ø 39.4, L2L 48.1, lug 20, T 13.2 (vs A: Ø 0 L2L +0.2 lug 0 T −0.4).A Ø 39.4B Ø 39.4C Ø 39.4D Ø 39.4A L2L 47.9B L2L 48.1C L2L 48.1D L2L 48.1A Seiko SSK059Ø 39.4 · L2L 47.9 · lug 20 · T 13.6B Seiko SRPG27Ø 39.4 · L2L 48.1 · lug 20 · T 13.2vs A: Ø 0 L2L +0.2 lug 0 T −0.4C Seiko SRPG29Ø 39.4 · L2L 48.1 · lug 20 · T 13.2vs A: Ø 0 L2L +0.2 lug 0 T −0.4D Seiko SRPG31Ø 39.4 · L2L 48.1 · lug 20 · T 13.2vs A: Ø 0 L2L +0.2 lug 0 T −0.4
A Seiko SSK059 and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ASeiko SSK059this watch
  2. BSeiko SRPG27W same · L2L +0.2 · T −0.4 mm
  3. CSeiko SRPG29W same · L2L +0.2 · T −0.4 mm
  4. DSeiko SRPG31W same · L2L +0.2 · T −0.4 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 movement: Seiko 4R34

Seiko SSK059 questions

How big is the Seiko SSK059?

The Seiko SSK059 measures 39.4 mm across, 47.9 mm lug to lug, 13.6 mm thick, 147 g.

Will the Seiko SSK059 fit a 7-inch wrist?

Balanced: the Seiko SSK059's 47.9 mm lug to lug takes 84% of the ~57.4 mm flat top of a 7-inch (17.8 cm) wrist. By the same estimate (circumference ÷ 3.1) it sits balanced from about 17 cm and overhangs the flat top on wrists under about 15 cm.

Does the Seiko SSK059 need a battery?

No. The Seiko SSK059 has no cell to replace: a wound mainspring drives its automatic Seiko 4R34.

What movement is in the Seiko SSK059?

The Seiko SSK059 runs on the Seiko 4R34, an automatic movement.

What strap size does the Seiko SSK059 take?

The Seiko SSK059 measures 20 mm between the lugs, so it takes a 20 mm strap with 20 mm spring bars. 62 other models in our base share that width.

Find the strap length for your wrist and the Seiko SSK059 in the watch strap size tool.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — SSK059 product page (5 Sports), seikowatches.com us-en · html · read
  2. 2Seiko Watch Corporation — Mechanical watch instructions, Cal. 4R34 (EN) · pdf · read
  3. 3CaliberCorner — Seiko Caliber 4R34 watch movement page · html · read