Strap for Constellation Master Chronometer 39 Stainless Steel / Sedna / Brown / Bracelet

The lug width of the Constellation 131.20.39.20.13.001 is 24mm. This measurement represents the space available between the two spring bar pins that secure the strap to the case. It is essential to verify this dimension to ensure perfect compatibility of an aftermarket strap and to guarantee stability and security during daily wear.

The best strap depends on your intended use. For formal occasions, we recommend a black alligator with ivory stitching that emphasizes the elegance of the case. For everyday versatility, a cognac brown calf pairs perfectly with Sedna Gold. For a more contemporary interpretation, a blue canvas NATO or a brushed black rubber strap offer personality and sports functionality while maintaining aesthetic harmony.

The strap change is done by removing the spring bars (the small metal pins that secure the strap to the lugs). Using a spring bar tool, push the pin downward to extract it from its seat. Once the old strap is removed, insert the new one by fitting it into the lugs, then reinsert the pins. We recommend performing this operation carefully to avoid damaging the case. If you prefer, the Casati Milano atelier is available for this service.

Yes, the Constellation 131.20.39.20.13.001 is fully compatible with quality aftermarket straps in 24mm size. On milanostraps.it you will find a wide selection of straps in alligator, calf, shell cordovan, rubber and NATO, all available ready to ship. All straps are verified for compatibility with this reference and customizable according to your preferences.

The lifespan of a leather strap varies based on the material and intensity of use. A quality alligator with vegetable tanning can last 3-5 years with daily wear, evolving aesthetically through the acquisition of a natural patina. Calf offers similar dynamics. Rubber and synthetic materials generally have greater longevity (5-7 years) but less aesthetic evolution. The Casati Milano atelier guarantees 18 months on custom-made straps, and all materials are selected to maximize durability and beauty over time.