Strap for Constellation Master Chronometer 39 Stainless Steel / Sedna Gold / Silver / Bracelet

The Omega Constellation 131.20.39.20.02.001 has a lug width of 24 mm. This is the distance between the two lateral lugs of the case and represents the essential technical parameter for choosing a compatible strap. Always verify this measurement with a caliper before ordering an aftermarket strap.

For this two-tone model in Sedna Gold and steel, we recommend an alligator in cognac or dark brown tones to enhance the rose gold, or pure black for elegant contrast. Alternatively, shell cordovan offers extraordinary durability and a natural patina that ages beautifully over time, perfect for those who wear the watch daily.

The replacement requires two tools: a springbar tool (small dual-pointed instrument) and a flat surface. Position the watch on the table, locate the small pins (springbars) at the ends of the lugs, insert one tip of the tool into the lateral hole of the springbar to compress the internal spring, remove the old strap, and repeat the operation from the opposite side. Insert the new strap by aligning the holes and release the springbar. If you prefer to avoid the risk, the Casati Milano atelier provides a strap change service with warranty.

Yes, any strap with a certified lug width of 24 mm is compatible. Lug width is the universal standard of compatibility: if you measure 24 mm between the case lugs, all 24 mm straps will fit correctly. The only variable is the curvature of the lug width in relation to the convexity of your case, which rarely causes issues with contemporary Omega models.

The lifespan depends on the leather quality, frequency of use, and care. A fine alligator or cordovan can last 5-10 years with daily wear; quality calf leather 3-5 years; synthetic NATO 2-3 years. Exposure to sunlight, sweat, and humidity accelerates aging. A custom strap from Casati Milano, made with selected leathers, includes an 18-month warranty and can be easily regenerated or replaced.