Strap for Constellation Co-Axial 35 Yellow Gold / Diamond / MOP Supernova / Rubber

The lug width is exactly 20mm. This is the parameter that determines strap compatibility and is measured from the left pin to the right pin inside the case. A 19mm or 21mm strap would either be unstable or not fit into the lugs.

Brown alligator leather remains the classic reference: the aligned grains pair naturally with gold, and the patina evolves in harmony with the case. A contemporary alternative is vegetable-tanned calf in cognac colour, which creates warm harmony and develops a fascinating patina over time.

Remove the strap by extracting the pins from the lugs with a specific tool (watchmaker's strap tool or Teflon-tipped pin pusher to avoid scratching). Insert the new strap by aligning the holes with the lugs, then reinsert the pins from both sides until the locking click. If unsure, entrust the task to a trusted watchmaker.

Yes, all straps certified with 20mm lug width are compatible. Always verify that the strap is 20mm width (not 19 or 21) and that the thicknesses suit the elegant proportions of the Constellation. Avoid excessive thicknesses that could deform the gold lugs.

A quality alligator or calf strap lasts 3–5 years with moderate daily wear. Frequent exposure to sun, water, or sweat shortens its life. A rich patina does not mean wear: on the contrary, it is a sign of the natural evolution of the leather. Casati Milano offers an 18-month warranty and replacements at reasonable costs.