Ingenieur Automatic 40

Ref. IW328901

Case diameter: 40 mm; Manufacturer spec
Lug-to-lug: 45.7 mm; Measured in a published review
Thickness: 10.8 mm; Measured in a published review
Lug width: —; Not published

Retail price $13,500 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 45.7 mm

How the Ingenieur Automatic 40 wears

Its lugs add 5.7 mm to the 40 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 6.5" to 7.5" (16.5–19.1 cm); below 6.5" the lugs start to reach the edge of the wrist.

At 10.8 mm thick it is thicker than 65% of the 43 other integrated bracelet watches we've measured, so expect it to sit tall on the wrist.

Will the Ingenieur Automatic 40 fit your wrist?

With a 45.7 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: IW328901
Collection: Ingenieur
Status: In production
Introduced: 2023
Case material: stainless steel
Crystal: sapphire
Water resistance: 100 m
Bezel: fixed steel bezel with screws
Dial: black
Strap / bracelet: integrated steel bracelet with butterfly clasp
Style: Integrated bracelet, Sport

Movement

Caliber: IWC 32111
Type: automatic
Power reserve: 120 hours
Frequency: 28,800 vph (4 Hz)
Jewels: 21

Watches that wear the same size

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

How the Ingenieur Automatic 40 wears

Will the Ingenieur Automatic 40 fit your wrist?

Specifications

Movement

Watches that wear the same size

Sources