Strap for De Ville Prestige Co-Axial 39.5 Stainless Steel / Vintage Silver Silk / Bracelet

The lug width of the Omega De Ville Prestige 39.50 mm, reference 424.10.40.20.02.005, is 20 millimetres. This value is fixed and represents the distance between the two upper and lower attachment points of the case. Always verify with a digital calliper that your new strap has 20 mm lugs to ensure perfect compatibility.

The best strap depends on your intended use. For formal contexts we recommend dark brown or deep black alligator, which enhance the minimalism of the case and pair perfectly with office attire. For a more contemporary option, vegetable-tanned calf develops an extraordinary natural patina. Shell cordovan is the ultimate luxury choice, offering compactness and deep lustre, while a polyamide NATO provides versatility and easy quick-change functionality.

The De Ville Prestige 39.50 mm is fitted with fixed lugs. To change the strap, use a spring bar tool: insert the curved tip under the small cylindrical spring that connects the lug to the strap, lifting slightly to release the tension. Once the spring is removed, the strap slides off the lugs. Refit the springs (verify they click into place) on the new strap, ensuring the lugs are exactly 20 mm. If you are not experienced, entrust the change to Casati Milano by appointment.

Yes, there are numerous aftermarket straps compatible with the 20 mm lug width. You can find online 20mm straps ready to ship, many of which are customisable in size, initials and stitching colour. Always verify that the lugs are precisely 20 mm and that the thickness fits the case lugs. Artisanal ateliers such as Casati Milano also create bespoke straps with personal choice of leather.

The lifespan of a leather strap depends on usage, leather quality, and care. A superior alligator or calf strap lasts an average of 4–7 years of daily wear if kept dry and protected from excessive moisture. Shell cordovan is more delicate: it fears rain and requires monthly conditioning with natural waxes, but under optimal conditions can last 8–10 years. Vegetable-tanned leather straps tend to break sooner (2–3 years) as the tannin becomes exhausted. Casati Milano guarantees 18 months on bespoke artisanal straps, covering construction defects.