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

The lug width of the Trésor 435.18.40.21.03.001 is 20mm. This measurement refers to the distance between the strap attachment pins on the case: it is the critical parameter to ensure that any aftermarket strap fits correctly without play or excessive tension. Always verify this specification before purchase.

Ideal materials are natural alligator for sharp aesthetic contrast, shell cordovan for patina evolution over time, and European vegetable-tanned calf leather for daily versatility. Avoid synthetic straps if you wish to respect the constructive character of the watch: the Trésor deserves quality leather.

Changing the strap requires a specific tool (spring bar tool) to push the lateral pins and extract them from the case. Insert the tool into the small hole visible under the lug, press the pin downward and slide the old strap outward. Repeat on the other side. The operation is reversible and does not require jeweler service if you have the correct tool.

Yes, provided you order a strap certified for 20mm lug width. Milanostraps always specifies compatibility for lug width in product details. If you have doubts, consult customer service before purchase. Custom straps from Casati Milano include 18-month warranty and preventive compatibility check.

Durability depends on use and maintenance. Premium quality alligator with vegetable tanning varies between 3-5 years of continuous daily wear. Shell cordovan, being more resistant, can last 6-7 years. Longevity increases significantly if you alternate straps during the week. Avoid prolonged water exposure and keep the leather dry to preserve fiber structure.