Intra-Matic Auto Chrono 40mm

Ref. H38416541

Case diameter: 40 mm; Manufacturer spec
Lug-to-lug: 49.2 mm; Measured in a published review
Thickness: 14.4 mm; Manufacturer spec
Lug width: 20 mm; Manufacturer spec

Retail price $2,595 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 49.2 mm

How the Intra-Matic Auto Chrono 40mm wears

Its lugs reach 9.2 mm past the 40 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 7" to 8.25" (17.8–21.0 cm); below 7" the lugs start to reach the edge of the wrist.

At 14.4 mm thick it is thicker than 67% of the 40 other chronograph 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; 156 other watches here share it, so aftermarket straps are easy to find.

Will the Intra-Matic Auto Chrono 40mm fit your wrist?

With a 49.2 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	Lugs overhang
6.5"	51.2 mm	Snug, lugs near the edge
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Ideal fit

Specifications

Reference: H38416541
Collection: Intra-Matic
Status: In production
Case material: stainless steel
Crystal: sapphire
Water resistance: 100 m
Dial: blue
Strap / bracelet: leather strap, pin buckle
Style: Chronograph

Movement

Caliber: Hamilton H-31
Type: automatic
Power reserve: 60 hours

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

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 Intra-Matic Auto Chrono 40mm.