HydroConquest 41mm

Ref. L3.781.4.56.6

Case diameter: 41 mm; Manufacturer spec
Lug-to-lug: 51.1 mm; Unverified
Thickness: 11.9 mm; Manufacturer spec
Lug width: 21 mm; Manufacturer spec

Retail price $2,000 (US, Oct 2026)

Your wristIdeal fit

Wrist flat: 55.1 mmLug-to-lug: 51.1 mm

How the HydroConquest 41mm wears

Its lugs reach 10.1 mm past the 41 mm case, more than the 7.1 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 8.5" (17.8–21.6 cm); below 7" the lugs start to reach the edge of the wrist.

At 11.9 mm thick it is slimmer than 85% of the 79 other dive watches we've measured, so it slides under a cuff more easily than most.

Its 21 mm lug width is one of the most common strap sizes; 28 other watches here share it, so aftermarket straps are easy to find.

Will the HydroConquest 41mm fit your wrist?

With a 51.1 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	Lugs overhang
7"	55.1 mm	Ideal fit
7.5"	59.1 mm	Ideal fit
8"	63 mm	Ideal fit

Specifications

Reference: L3.781.4.56.6
Collection: HydroConquest
Status: In production
Case material: stainless steel
Crystal: sapphire, AR both sides
Water resistance: 300 m
Bezel: unidirectional, ceramic insert
Dial: black (sunray)
Strap / bracelet: steel bracelet, double-safety folding clasp
Style: Dive

Movement

Caliber: Longines L888
Type: automatic
Power reserve: 72 hours
Frequency: 25,200 vph (3.5 Hz)

2 other watches use the Longines L888

Takes 21 mm straps. See other 21 mm watches and straps.

Watches that wear the same size

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

Same 21 mm lug width

All 21 mm watches

These take the same straps as the HydroConquest 41mm.