Strap for HydroConquest 41 Automatic Stainless Steel / Matte Black / Bracelet

The lug width of the Longines HydroConquest L3.781.4.05.6 is 21mm. This dimension is fixed and must be measured with millimetre precision using a digital calliper positioned perpendicularly to the case lugs. Any compatible strap must have a 21mm lug width exactly.

The best strap depends on specific use. For professional aquatic environments, we recommend a technical NATO in Cordura for rapid drying. For elegance, vegetable-tanned alligator with natural patina creates consonance with the dark blue dial. For daily versatility, vegetable-tanned calf in cognac or dark brown offers balance between aesthetics and practicality.

The strap is replaced by removing the spring bars located in the case lugs, using a dedicated tool or small screwdriver. Position the new strap with 21mm lug width and reinsert the spring bars until they click into place. If you are inexperienced, contact Casati Milano atelier for professional replacement with seal verification.

Yes, any strap with 21mm lug width is compatible. Milanostraps.it offers an extensive selection of artisanal 21mm straps in alligator, leather, shell cordovan and NATO, all customisable in size, initials and stitching thread. Always verify that the strap is specifically designated 21mm to avoid width errors.

A quality strap with vegetable tanning lasts 2-4 years with ordinary maintenance (periodic cleaning, drying after humidity exposure). In frequent aquatic environments, lifespan reduces to 1-2 years. Alligator and shell cordovan age gracefully by developing patina. Casati Milano guarantees 18 months and recommends periodic regeneration with natural waxes to extend strap life.