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Seiko SUR373

The Seiko SUR373 measures 40.2 mm across, 47 mm lug to lug, and 8.4 mm thick, with 20 mm lugs. It fits wrists from ~16.5 cm (flat-fit estimate).

Sources checked · How we source numbers
Case
40.2 mm1
Lug to lug
47 mm1
Thickness
8.4 mm1
Lug width
20 mm1
Seiko SUR373: size drawingSeiko SUR373, round case, top and side view to scale: case diameter 40.2 mm, lug to lug 47 mm, lug width 20 mm, thickness 8.4 mm. Bezel, dial and crown size are schematic.lug width 20Ø 40.2lug to lug 47TOPthickness 8.4SIDE
Seiko SUR373, top and side, to scaleDrawing from data, not a photo · mm

Seiko SUR373 specifications

Case diameter
40.2 mm1
Lug to lug
47 mm1
Thickness
8.4 mm1
Lug width
20 mm120 mm watches
Weight
74 g1
Crystal
Sapphire crystal1
Water resistance
10 bar (100 m)1
Movement
not found in our sources yet
Battery
not published
Years made
start not published
Case code
not in our data yet
Line
Discover More1

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 ~15 cm.

= 6.7 in

Balanced on a 17 cm wrist: the 47 mm lug to lug covers 86% 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 SUR373: wrist fitSeiko SUR373 on a wrist, top view to scale. lug to lug 47 mm. Wrist 170 mm, estimated flat width 54.8 mm (circumference / 3.1). Ratio 0.86: balanced.wrist, flat topwrist flat ≈ 54.8lug to lug 47Balanced · 47 / 54.8 = 0.86estimate: wrist 170 / 3.1 = 54.8 flatcompactbalancededgeoverhang0.750.891
Seiko SUR373 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 SUR373 at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Seiko SUR373: size drawingSeiko SUR373, round case, top and side view to scale: case diameter 40.2 mm, lug to lug 47 mm, lug width 20 mm, thickness 8.4 mm. Bezel, dial and crown size are schematic.lug width 20Ø 40.2lug to lug 47TOPthickness 8.4SIDE
Drawing from data, not a photo · mm
01020304050

Seiko SUR373 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 SUR373 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

Our sources don't name the movement of the Seiko SUR373 yet.

Same size as the Seiko SUR373

The models nearest to the Seiko SUR373 in case width and lug to lug, drawn over it to scale; below, every model within 1 mm of its 47 mm.

Size comparison: Seiko SUR373, Spinnaker SP-5100-22, Zelos Helmsman SS Meteorite, Seiko SSA457Top-view outlines to scale on one centre. A Seiko SUR373: Ø 40.2, L2L 47, lug 20, T 8.4. B Spinnaker SP-5100-22: Ø 40, L2L 47, lug —, T 13.8 (vs A: Ø −0.2 L2L 0 T +5.4). C Zelos Helmsman SS Meteorite: Ø 40, L2L 46.5, lug 20, T 12.5 (vs A: Ø −0.2 L2L −0.5 lug 0 T +4.1). D Seiko SSA457: Ø 40.5, L2L 47.5, lug 20, T 11.6 (vs A: Ø +0.3 L2L +0.5 lug 0 T +3.2).B Ø 40C Ø 40A Ø 40.2D Ø 40.5C L2L 46.5A L2L 47B L2L 47D L2L 47.5A Seiko SUR373Ø 40.2 · L2L 47 · lug 20 · T 8.4B Spinnaker SP-5100-22Ø 40 · L2L 47 · lug — · T 13.8vs A: Ø −0.2 L2L 0 T +5.4C Zelos Helmsman SS MeteoriteØ 40 · L2L 46.5 · lug 20 · T 12.5vs A: Ø −0.2 L2L −0.5 lug 0 T +4.1D Seiko SSA457Ø 40.5 · L2L 47.5 · lug 20 · T 11.6vs A: Ø +0.3 L2L +0.5 lug 0 T +3.2
A Seiko SUR373 and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ASeiko SUR373this watch
  2. BSpinnaker SP-5100-22W −0.2 · L2L same · T +5.4 mm
  3. CZelos Helmsman SS MeteoriteW −0.2 · L2L −0.5 · T +4.1 mm
  4. DSeiko SSA457W +0.3 · L2L +0.5 · T +3.2 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.

Seiko SUR373 questions

How big is the Seiko SUR373?

The Seiko SUR373 measures 40.2 mm across, 47 mm lug to lug, 8.4 mm thick, 74 g.

Will the Seiko SUR373 fit a 6.5-inch wrist?

Balanced: the Seiko SUR373's 47 mm lug to lug takes 88% 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 15 cm.

What strap size does the Seiko SUR373 take?

The Seiko SUR373 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 SUR373 in the watch strap size tool.

More Seiko watches

Sources

Documents checked · Report a wrong number

  1. 1Seiko Watch Corporation — SUR373 product page (Discover More), seikowatches.com no-en · html · read