Strap for Hydroconquest Chronograph L688

The lug width of the Longines HydroConquest L3.696.4.03.6 is 20mm. This measurement is taken between the inner points where the strap attaches to the case. It is essential to verify this dimension before ordering an aftermarket strap to ensure perfect compatibility.

The ideal strap depends on usage and personal preference. For formal elegance, we recommend alligator leather with vegetable tanning in dark brown or shell cordovan; for urban versatility, a cognac or grey calf skin; for marine environments, technical FKM rubber or a blue NATO. Each choice transforms the watch's character whilst maintaining structural compatibility.

To change the strap, you will need a spring bar removal tool or a blunt knife. Position the watch on a stable surface, locate the small springs that lock the strap to the lugs, and gently push from one side to release it. Repeat for both lugs. Insert the new strap by aligning the holes with the pins and press until it clicks. For professional assistance, Casati Milano offers strap replacement by appointment.

Yes, all straps with 20mm lug width are structurally compatible. Milanostraps.it offers a wide selection of materials (alligator, calf, shell cordovan, rubber, NATO) that are customisable in size, stitching thread, and initials. Artisan quality ensures durability and functionality equivalent to factory equipment.

Durability depends on leather quality, usage, and maintenance. An alligator or shell cordovan strap with vegetable tanning lasts 5–8 years with daily wear and regular care (cleaning, rapid drying after perspiration, annual conditioning). Calf leather is slightly more delicate, lasting 3–5 years. All Casati Milano straps carry an 18-month warranty against manufacturing defects.