Strap for Souveraine Chronomètre Optimum 42 Platinum

The lug width is 20mm. Measurement should be taken with a digital calliper, positioning the probe perpendicular to the interior space between the two lugs. This width is specific to the 1510 CO 42 PT model and is essential for precise strap fitting without lateral play.

For the platinum 1510 CO 42 PT, we recommend an alligator strap in black with European tanning (fine, uniform grain texture) or vegetable-tanned calf in cognac brown. Both allow the case to remain the visual focal point without competing aesthetically. For informal occasions, an anthracite-grey NATO or FKM rubber maintains the design's formality.

The Souveraine 1510 CO 42 PT uses spring bar bayonet attachments. For strap change, position the watch horizontally with the lug facing up, release the spring bar (usually with a small tool or tweezers), remove the old strap, and insert the new one until mechanical click closure is achieved. Avoid excessive twisting during this operation.

Any strap with a 20mm lug width is compatible. Ensure the strap is specifically labelled for 20mm: do not use 19mm straps (too tight) or 21mm straps (too loose). On milanostraps.it you can filter by 20mm lug width and find all compatible options.

A quality leather strap (alligator or vegetable-tanned calf) typically lasts 3–5 years with daily use, depending on moisture, heat, and wear exposure. The leather develops a natural patina that enriches its appearance. NATO or rubber straps have greater longevity (5–7+ years). It is recommended to rotate multiple straps to extend the life of each.