Strap for Hydroconquest Quartz 39 Blue

The lug width of the Longines HydroConquest L3.688.4.03.6 is 19mm. This is the internal width between the two lugs of the case. Always verify the measurement before purchasing a strap: the measurement is taken with a calliper on the inner shoulder of the lug, from end to end.

The best strap depends on intended use. For daily elegance: alligator with vegetable tanning or fine-grained calf leather. For sports and water: structured rubber or canvas NATO. For classic-modern style: high-quality shell cordovan. The choice must respect the proportions of the case and water resistance up to 300 metres, favouring noble materials that dialogue with the brushed steel.

Strap changing is done using a specific tool (spring bar tool) to extract the oscillating pins (spring bars) from the lugs. Insert the tool into the lateral groove of the lug, gently lift the pin to free the old strap. Insert the new strap ensuring that both pins are correctly positioned and locked. If you are not experienced, rely on a professional: the steel of your Longines lugs deserves precision.

Yes, you can use superior quality aftermarket straps as long as they respect the 19mm lug width. Artisanal straps in alligator, calf leather or shell cordovan offer greater customisation and often superior craftsmanship compared to manufacturer straps. Ensure that the strap is constructed with robust buckles and double stitching to maintain water resistance up to 300 metres.

A high-quality leather strap (vegetable-tanned alligator or shell cordovan) typically lasts 3-5 years with daily use and proper care. The material develops an elegant patina over time. Durability depends on use: water exposure, sunlight and excessive humidity reduce longevity. A rubber strap lasts longer (5-7 years) but requires regular cleaning. With proper maintenance, it is possible to significantly extend the life of the strap.