Strap for HydroConquest 41 Automatic Stainless Steel / Ceramic / Blue / Bracelet

The lug width of the Longines HydroConquest L3.781.4.96.6 is 21mm. This measurement represents the distance between the attachment points of the lugs on the case, measured from the inner edge of one lug to the inner edge of the opposite lug. To verify strap compatibility, measure internally on the case, perpendicular to the lugs, using a tailor's measuring tape or digital calliper. Incorrect measurement is the most common cause of incompatible purchases.

For this model, we recommend three options based on use case: alligator leather in black or deep brown for formal and sports elegance; Italian calf leather with vegetable tanning for those who appreciate natural patina development over time; shell cordovan for maximum durability and lustre. All three leathers pair superbly with the blue sunburst dial. For summer or marine use, a NATO strap in technical fabric or a Tropic rubber strap offers practicality without aesthetic compromise. The stainless steel case accommodates any material selection flawlessly.

The strap is changed by removing the lug pins using a specialised tool (spring bar tool). Position the tool beneath the internal spring of the lug, press to compress the spring and slide the pin outward. Repeat on both sides. Align the new strap with the lugs and reintroduce the pins, allowing the spring to snap into position. Perform this operation on a soft surface (mousepad) to avoid scratching the case. If unsure, contact an authorised Longines service centre.

Yes, any strap with a 21mm lug width is compatible with the L3.781.4.96.6. Aftermarket straps often offer superior build quality and premium materials (alligator, shell cordovan, vegetable-tanned calf) compared to factory-standard options. Milano Straps provides artisanal 21mm straps customisable in fit, initials, finishes and stitch colour, with extended warranty. The choice of a bespoke strap transforms your timepiece into a unique, authentic instrument.

Durability varies based on material and use frequency. A quality alligator or calf leather strap, worn regularly, lasts 3–5 years before replacement becomes necessary. Shell cordovan can endure 7–10 years owing to fibre density and resilience. Exposure to direct sunlight, humidity and perspiration accelerates aging. Vegetable tanning applied by specialist tanneries develops natural patina and improves with time. To extend lifespan, allow the strap to air-dry after water exposure without direct heat, and avoid aggressive detergents.