Seiko 5 Automatic Military

Ref. SNK803

Case diameter: 37 mm; Measured in a published review
Lug-to-lug: 43 mm; Measured in a published review
Thickness: 11 mm; Measured in a published review
Lug width: 18 mm; Measured in a published review

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 43 mm

How the Seiko 5 Automatic Military wears

Its lugs add 6 mm to the 37 mm case, close to the 7 mm typical across the almanac, so its diameter is a fair guide to how it wears.

On our fit model it sits best on wrists from 6" to 7.25" (15.2–18.4 cm); below 6" the lugs start to reach the edge of the wrist.

At 11 mm thick it is slimmer than 71% of the 42 other field watches we've measured, so it slides under a cuff more easily than most.

Its 18 mm lug width is one of the most common strap sizes; 19 other watches here share it, so aftermarket straps are easy to find.

Will the Seiko 5 Automatic Military fit your wrist?

With a 43 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.

Wrist	Flat width (est.)	Fit
6"	47.2 mm	Ideal fit
6.5"	51.2 mm	Ideal fit
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Wears small
8"	63 mm	Wears small

Specifications

Reference: SNK803
Collection: Seiko 5
Status: Discontinued
Case material: bead-blasted stainless steel
Crystal: Hardlex
Water resistance: 30 m
Bezel: fixed
Dial: beige/cream
Strap / bracelet: canvas strap
Style: Field, Everyday

Movement

Caliber: Seiko 7S26
Type: automatic
Power reserve: 41 hours
Frequency: 21,600 vph (3 Hz)
Jewels: 21

4 other watches use the Seiko 7S26

Takes 18 mm straps. See other 18 mm watches and straps.

Watches that wear the same size

Other watches within 1.5 mm of its lug-to-lug.

Same 18 mm lug width

All 18 mm watches

These take the same straps as the Seiko 5 Automatic Military.