Strap for Hydroconquest Chronograph

The lug width of the Longines HydroConquest L3.644.4.96.2 is 20mm. This measurement represents the internal space between the caselugs and is essential for selecting the correct strap. 20mm straps are compatible without adapters or invasive modifications. To verify, place a ruler between the lugs: it must measure exactly 20mm.

The best strap depends on usage: for actual diving, vulcanised rubber or marine-grade cordura offer superior saltwater resistance and rapid drying. For daily wear, vegetable-tanned calf develops deep patina over time whilst maintaining sporty elegance. Shell cordovan is not recommended due to sensitivity to prolonged moisture. The strap should reflect the instrumental nature of this diver without excessive chromatic emphasis.

The process is straightforward: use a spring bar tool to gently lift the horizontal pin connecting the strap to the case. Press downwards, extract the pin and remove the old strap. Position the new strap, aligning it with the holes, insert the pin and verify it is fully seated and parallel to the case. Do not force: the pin must click naturally into place. Avoid hammers or non-specialist tools.

Yes, the L3.644.4.96.2 is fully compatible with quality 20mm aftermarket straps. The bayonet-style lug accepts both classic passants and folding deployante clasps. MilanoStraps offers bespoke 20mm leather straps customisable in leather type, length and thread colour, all tested on professional divers. Casati Milano crafts made-to-measure straps with personally selected leathers and 18-month warranty.

A quality leather strap (calf, alligator, vegetable-tanned) typically lasts 5–8 years with daily wear, developing characteristic patina. Lifespan depends on exposure to moisture, perspiration and sunlight: frequent water use reduces longevity to 3–4 years. Vulcanised rubber straps last 7–10 years, synthetic NATO straps 4–6 years. Casati Milano offers 18-month warranty on bespoke straps; beyond this period, the strap can be fully replaced or repaired at stitch level.