Strap for Hydroconquest GMT 43 Stainless Steel / Green / Bracelet

The Longines HydroConquest L3.890.4.06.6 features a 22mm lug width, measured between the spring bar pins connecting the lugs to the case. This dimension is the industrial standard for mid-size professional divers of 43mm diameter and ensures compatibility with all straps manufactured to this specification.

For this professional diver, Tuscan leather with vegetable tanning represents the optimal choice: it delivers water-resistant durability, develops natural patina over time, and maintains reliable grip even on wet wrists. Alligator leather with vegetable tanning offers a valid alternative for those seeking more technical aesthetics whilst maintaining diving-specific performance.

The strap is changed by carefully extracting the spring bar pins that connect the lugs to the case using specialised watchmaking tools. Many Swiss watchmakers perform strap changes at no charge when purchasing an aftermarket strap. It is advisable not to force the pins to avoid damage to the lugs.

Yes, any strap manufactured for 22mm lug width is compatible with the L3.890.4.06.6. Bespoke artisanal straps additionally permit selection of leather type, colour, pad thickness and stitch specifications to customise the strap to your aesthetic and functional preferences.

A high-quality Tuscan leather strap with vegetable tanning has a lifespan of 4–6 years under daily wear with regular maintenance (damp cloth cleaning and occasional balm treatments). The strap does not deteriorate from salt exposure if dried promptly after diving. Natural ageing is integral to leather character.