Sport 9F GMT

Ref. SBGN027

Case diameter: 39 mm; Manufacturer spec
Lug-to-lug: 45.9 mm; Manufacturer spec
Thickness: 12.3 mm; Manufacturer spec
Lug width: 19 mm; Manufacturer spec

Retail price $3,700 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 45.9 mm

How the Sport 9F GMT wears

Its lugs add 6.9 mm to the 39 mm case, close to the 7.1 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 6.5" to 7.75" (16.5–19.7 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 12.3 mm thick it is slimmer than 58% of the 24 other gmt watches we've measured, so it slides under a cuff more easily than most.

Its 19 mm lug width is one of the most common strap sizes; 21 other watches here share it, so aftermarket straps are easy to find.

Will the Sport 9F GMT fit your wrist?

With a 45.9 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.

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

Specifications

Reference: SBGN027
Collection: Sport
Status: In production
Case material: stainless steel
Crystal: sapphire
Water resistance: 200 m
Bezel: 24-hour bezel
Dial: black
Strap / bracelet: three-row stainless steel bracelet, folding clasp
Weight: 151 g
Style: GMT, Sport

Movement

Caliber: Grand Seiko 9F86
Type: quartz
Accuracy: +/-10 s/year

Takes 19 mm straps. See other 19 mm watches and straps.

Watches that wear the same size

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

Same 19 mm lug width

All 19 mm watches

These take the same straps as the Sport 9F GMT.

Sources

grand-seiko.com/us-en/collections/sbgn027g