Watch Almanac
Seiko

5 Sports Field GMT

Ref. SSK023

Case diameter
39.4 mm
Manufacturer spec
Lug-to-lug
47.9 mm
Manufacturer spec
Thickness
13.6 mm
Manufacturer spec
Lug width
20 mm
Manufacturer spec

Retail price $450 (US, Oct 2026)

Ideal fit
Wrist flat: 55.1 mmLug-to-lug: 47.9 mm

How the 5 Sports Field GMT wears

Its lugs reach 8.5 mm past the 39.4 mm case, more than the 7 mm typical across the almanac, so it wears larger than its diameter suggests.

On our fit model it sits best on wrists from 6.75" to 8" (17.1–20.3 cm); below 6.75" the lugs start to reach the edge of the wrist.

At 13.6 mm thick it is thicker than 75% of the 36 other gmt watches we've measured, so expect it to sit tall on the wrist.

Its 20 mm lug width is one of the most common strap sizes; 186 other watches here share it, so aftermarket straps are easy to find.

Will the 5 Sports Field GMT fit your wrist?

With a 47.9 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.

WristFlat width (est.)Fit
6"47.2 mmLugs overhang
6.5"51.2 mmSnug, lugs near the edge
7"55.1 mmIdeal fit
7.5"59.1 mmIdeal fit
8"63 mmIdeal fit

Specifications

Reference
SSK023
Collection
5 Sports
Status
In production
Case material
stainless steel
Crystal
Hardlex
Water resistance
100 m
Bezel
fixed
Dial
black
Strap / bracelet
multi-link stainless steel bracelet, three-fold clasp with secure lock
Weight
147 g
Style
GMT, Field

Movement

Caliber
Seiko 4R34
Type
automatic
Power reserve
41 hours
Jewels
24

3 other watches use the Seiko 4R34

Takes 20 mm straps. See other 20 mm watches and straps.

More 5 Sports references

Watches that wear the same size

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

Same 20 mm lug width

All 20 mm watches

These take the same straps as the 5 Sports Field GMT.

Sources