Strap for Hydroconquest Chronograph L688

The Longines HydroConquest L3.696.4.53.6 features a 20-millimetre lug width, measured internally between the spring bar anchors. This specification is standard for the model and ensures balanced proportions with the 41-millimetre case diameter. All watch straps classified as '20mm' on milanostraps.it are fully compatible with this reference.

Selection depends on usage and dial finish. For formal elegance with sportiness, alligator leather in deep petrol blue or dark brown is ideal: the regular bubble texture balances the chronograph's athletic character whilst maintaining refinement. Vegetable-tanned calf represents a versatile alternative: it develops natural patina and offers warmer tone. For intensive water use, we recommend FKM rubber or NATO fabric, both resistant to chlorine and saltwater without rapid aesthetic degradation.

Strap replacement requires a simple tool: a spring bar remover tool. Position the watch with the strap facing upward, insert the tool's tip into the groove of the internal spring mechanism, apply gentle pressure to compress the spring, and slide out the pin. Repeat on the opposite lug. To fit the new strap, align the holes with the pins and allow the springs to click into position. If inexperienced, the Casati Milano atelier applies straps at no additional cost upon purchase.

Any strap with a 20mm lug width is compatible, regardless of material. The milanostraps.it 20mm collection includes alligator, calf, shell cordovan, NATO, elasticated and rubber options. The sole criterion is desired aesthetics and functionality. Avoid straps labelled 19mm or 21mm, as these would create excess play or prevent fitting.

Durability depends on material and use patterns. A vegetable-tanned calf strap, with standard maintenance (avoiding frequent immersion, air-drying after freshwater contact), maintains structural integrity for 4–6 years. Alligator, being more resistant, exceeds 6–8 years. Frequent immersion or constant saltwater exposure reduces leather strap lifespan: in such cases, FKM rubber is recommended. milanostraps.it straps carry an 18-month warranty against manufacturing defects and stitching; natural leather wear is excluded.