SUB 250T GMT Professional

Ref. 855.10.351.10

Case diameter: 40 mm; Manufacturer spec
Lug-to-lug: 42.9 mm; Manufacturer spec
Thickness: 10.8 mm; Manufacturer spec
Lug width: 18 mm; Manufacturer spec

Retail price $2,790 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 42.9 mm

How the SUB 250T GMT Professional wears

Its lugs add only 2.9 mm to the 40 mm case, against 7.1 mm typical across the almanac, so it wears smaller than its diameter suggests.

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 10.8 mm thick it is slimmer than 99% of the 79 other dive 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; 12 other watches here share it, so aftermarket straps are easy to find.

Will the SUB 250T GMT Professional fit your wrist?

With a 42.9 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	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: 855.10.351.10
Collection: SUB 250T GMT
Status: In production
Case material: stainless steel
Crystal: sapphire
Water resistance: 250 m
Bezel: unidirectional with no-decompression scale (feet)
Dial: orange (Professional)
Strap / bracelet: 'Beads of Rice' steel bracelet or FKM rubber strap, ratcheting wetsuit extension
Style: Dive, GMT

Movement

Movement details coming soon.

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 SUB 250T GMT Professional.

Sources

doxawatches.com/products/sub-250t-gmt-professional