Strap for De Ville Trésor Master Chronometer Stainless Steel / Diamond / Silver

The lug width of the Trésor 435.18.40.21.02.001 is 20 millimetres (measured inside to inside between the lugs). This dimension is strictly controlled in Omega production; aftermarket straps must respect the tolerance of ±0.1 mm to guarantee a perfect fit without chronic friction.

Alligator is the historical aesthetic choice: the natural grain creates a contrast of lustre without competing with the case. Vegetable-tanned calf is the versatile alternative, ageing beautifully and developing patina. For sports use, NATO or FKM rubber are practical and resistant to moisture.

Insert a spring bar tool into the end of the lug (the one not covered by the lug). Press gently downward to release the pin, extract the old strap. Insert the new strap aligning the hole with the pin, press the spring bar until it clicks. Repeat on the other side. The operation takes 2-3 minutes.

Yes, all straps with 20mm lug width are compatible with the Trésor. MilanoStraps offers a selection of alligator, calf, NATO and rubber for this size, with fast shipping and customisation options at Casati Milano.

A quality artisanal alligator or calf strap lasts 4-7 years with daily use, provided it is kept dry after water contact. Vegetable tanning ages even better, developing patina; FKM rubber straps resist 5-8 years before natural material hardening occurs.