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Seiko watch · SKX series · automatic

Seiko SKX007

The Seiko SKX007 measures 42.5 mm across, 46 mm lug to lug, and 13.25 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
2 sources disagree; show every value
  • measured 42.5 mm1
  • measured 42 mm2
Lug to lug
46 mm1
Thickness
13.25 mm1
2 sources disagree; show every value
  • measured 13.25 mm1
  • measured 13 mm2
Lug width
22 mm1
SKX007, front view
Photo: Ashley Pomeroy, CC BY-SA 4.0, via Wikimedia Commons
Seiko SKX007: size drawingSeiko SKX007, round case, top and side view to scale: case diameter 42.5 mm, lug to lug 46 mm, lug width 22 mm, thickness 13.25 mm, crown at 4 o'clock, rotating bezel. Bezel, dial and crown size are schematic.lug width 22Ø 42.5lug to lug 46TOPcrown 4Hthickness 13.25SIDE
Seiko SKX007, top and side, to scaleDrawing from data, not a photo · mm

Seiko SKX007 specifications

Case diameter
42.5 mm1measured
2 sources disagree; show every value
  • measured 42.5 mm1
  • measured 42 mm2
Lug to lug
46 mm1measured
Thickness
13.25 mm1measured
2 sources disagree; show every value
  • measured 13.25 mm1
  • measured 13 mm2
Lug width
22 mm1measured22 mm watches
Crystal
Hardlex1measured
Water resistance
200 m5seller listing
Movement
Seiko 7S265seller listing · automaticSeiko 7S26 specs
Battery
none: the Seiko 7S26 is automatic
Years made
19961secondary source – 20196secondary source
Case code
not in our data yet
Bezel
unidirectional rotating6owner reports
Crown at
4 o'clock1measured
Line
SKX series6secondary source

Seiko SKX007 strap size

Lug width 22 mm1measured: 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 SKX007 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

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 SKX007: wrist fitSeiko SKX007 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 SKX007 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 SKX007 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SKX007: size drawingSeiko SKX007, round case, top and side view to scale: case diameter 42.5 mm, lug to lug 46 mm, lug width 22 mm, thickness 13.25 mm, crown at 4 o'clock, rotating bezel. Bezel, dial and crown size are schematic.lug width 22Ø 42.5lug to lug 46TOPcrown 4Hthickness 13.25SIDE
Drawing from data, not a photo · mm
01020304050

Same size as the Seiko SKX007

The models nearest to the Seiko SKX007 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 SKX007, Seiko SSC957, Islander ISL-94, Seiko SARX055Top-view outlines to scale on one centre. A Seiko SKX007: Ø 42.5, L2L 46, lug 22, T 13.25. B Seiko SSC957: Ø 41.4, L2L 45.9, lug 21, T 13 (vs A: Ø −1.1 L2L −0.1 lug −1 T −0.25). C Islander ISL-94: Ø 42, L2L 47, lug —, T 13 (vs A: Ø −0.5 L2L +1 T −0.25). D Seiko SARX055: Ø 40.8, L2L 46.2, lug —, T 11 (vs A: Ø −1.7 L2L +0.2 T −2.25).D Ø 40.8B Ø 41.4C Ø 42A Ø 42.5B L2L 45.9A L2L 46D L2L 46.2C L2L 47A Seiko SKX007Ø 42.5 · L2L 46 · lug 22 · T 13.25B Seiko SSC957Ø 41.4 · L2L 45.9 · lug 21 · T 13vs A: Ø −1.1 L2L −0.1 lug −1 T −0.25C Islander ISL-94Ø 42 · L2L 47 · lug — · T 13vs A: Ø −0.5 L2L +1 T −0.25D Seiko SARX055Ø 40.8 · L2L 46.2 · lug — · T 11vs A: Ø −1.7 L2L +0.2 T −2.25
A Seiko SKX007 and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ASeiko SKX007this watch
  2. BSeiko SSC957W −1.1 · L2L −0.1 · T −0.25 mm
  3. CIslander ISL-94W −0.5 · L2L +1 · T −0.25 mm
  4. DSeiko SARX055W −1.7 · L2L +0.2 · T −2.25 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 7S26

Movement: Seiko 7S26

The Seiko SKX007 runs on the Seiko 7S26, an automatic movement. 2 other models in our base use it.

Beat rate
21,600 bph7
Power reserve
41 h7
Jewels
217

Battery

none: the Seiko 7S26 is automatic

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

Parts documented for the Seiko SKX007

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

Seiko SKX007 questions

What is the lug width of the Seiko SKX007?

The Seiko SKX007 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 SKX007 in the watch strap size tool.

How big is the Seiko SKX007?

The Seiko SKX007 measures 42.5 mm (42 mm measured) across, 46 mm lug to lug, 13.25 mm (13 mm measured) thick.

Will the Seiko SKX007 fit a 6.5-inch wrist?

Balanced: the Seiko SKX007'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.

What movement is in the Seiko SKX007?

The Seiko SKX007 runs on the Seiko 7S26, an automatic movement.

Does the Seiko SKX007 need a battery?

No. The Seiko SKX007 has no cell to replace: a wound mainspring drives its automatic Seiko 7S26.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Worn & Wound — Seiko SKX007 Review - Worn & Wound · html · read
  2. 2Worn & Wound — Seiko SKX007 (Worn & Wound article, older version) · html · read
  3. 3StrapsCo — Seiko Lug Widths & Strap Sizes (reference table) · html · read
  4. 4WatchClicker — Seiko Turtle SRP777 Review - compared to SKX007 · html · read
  5. 5Watchoutz — Seiko 5 Sports Mechanical Automatic 200M Diver Black-Dial SKX007K (product page) · html · read
  6. 6Fratello Watches — 6 Discontinued Seiko Watches Collectors Love (dated January 6, 2020) · html · read
  7. 7Seiko Watch Corporation — Instructions: Seiko Automatic Diver's Watch Cal. 4R15/4R16/4R35/4R36/7S26/7S35/7S36 (English) · pdf · read
  8. 8Grail Watch — Grail Watch Reference: Seiko Cal. 7S26 · html · read