Strap for De Ville Prestige Co-Axial 39.5 Power Reserve Yellow Gold / Diamond / Silver

The lug width of the Omega De Ville 424.58.40.21.52.001 is exactly 20 mm. Measuring correctly is essential: position a digital caliper from the center of one spring bar to the center of the other. An 18 mm strap would shift in the slot; a 22 mm strap cannot be installed. For the De Ville, only 20 mm straps guarantee the correct fit.

Dark brown alligator (Hermès Barenia brown) or shell cordovan burgundy represent the most elegant choices. Alligator offers a natural grain that is nearly invisible and reflects the warmth of 18k gold, while cordovan develops an amber patina over time creating an almost perfect chromatic symbiosis. For less formal contexts, vegetable-tanned calf maintains elegance with restraint.

Remove the watch from your wrist. Locate the two horizontal pins (spline pins) at the extremities of the case, one on each side. Use a dedicated tool (spring bar tool) to press against the pin from one side, releasing the internal spring. Remove the old strap, introduce the new one by aligning the pins in their seats and let the spring return to position. The procedure takes 2-3 minutes and requires no excessive force.

Only straps with a 20 mm lug width are compatible. Milano Straps offers a wide selection in alligator, shell cordovan, vegetable-tanned calf and rubber, all constructed to the same standard as Omega. Always verify that the strap is marked 20 mm and compatible with the case diameter (39.50 mm) before purchase.

A premium leather strap (alligator, cordovan) lasts on average 5-7 years with moderate daily use. Longevity depends on exposure to humidity, direct sunlight and frequency of wear. A shell cordovan strap develops desirable patina and improves aesthetically over time; an alligator maintains the original structure longer. To extend life, avoid prolonged immersions and apply leather conditioner 1-2 times per year.