Strap for Hydroconquest Chronograph Quartz

The lug width of the Longines HydroConquest L3.650.4.96.6 is 21 mm. This measurement is specific to this model and does not correspond to the 20 mm standard found on many sports watches. It is essential to verify this dimension before purchasing an aftermarket strap by measuring directly the space between the two lugs of the case with a tape measure.

The most versatile strap for this model is alligator leather with a fine grain: it offers instrumental elegance and mechanical robustness. Alternatively, vegetable-tanned calf leather is excellent for those who prefer a natural patina that develops over time. To fully showcase the diving credentials, a structured rubber strap represents the most technical choice. The decision depends on the primary use environment and personal aesthetic preferences.

To change the strap, it is necessary to remove the spring bars (pins) that connect the case lugs to the current strap. Use a dedicated tool (spring bar tool) or consult a watchmaker to avoid damage. Insert the new strap by applying gentle pressure to the spring bars until they are fully seated. Verify that the strap is properly centred relative to the case lugs before considering the operation complete.

Yes, you can use aftermarket straps provided they strictly respect the 21 mm lug width. Artisan-made straps of premium quality, crafted from materials such as alligator, vegetable-tanned calf leather, or structured rubber, often offer superior construction quality to original straps. Always ensure that the new strap allows fluid articulation without lateral play.

A quality leather strap, crafted in alligator or vegetable-tanned calf leather, has an average lifespan of 3–5 years with daily wear, provided regular maintenance is observed. Prolonged exposure to water, even though the watch is water-resistant, reduces strap longevity. A rubber strap has a similar lifespan, whilst technical fabric may last 2–3 years. Casati Milano provides an 18-month guarantee on all custom-made straps.