Strap for Seamaster Diver 300M Master Co-Axial 42 Sedna Gold / Black / Rubber

The lug width is 20mm. This measurement represents the space between the case lugs and is crucial for strap compatibility. Even a few millimeters of error makes it impossible to insert the strap correctly and compromises the safe wear of the watch.

For the Sedna Gold case, we recommend alligator with vegetable tanning in dark brown or solid-colored calf leather. Alligator enhances the warm color tone of rose gold, while calf offers an elegant and neutral base. For frequent underwater use, technical rubber with fabric backing ensures maximum resistance and functionality.

Strap replacement is done via spring bars: small metal pins with springs that hold the strap in the case lugs. Using a spring bar tool, apply pressure from bottom to top to release the pin, then remove the old strap and position a new one. It is a simple operation but requires care to avoid damaging the case.

Yes, as long as the lug width is exactly 20mm. Always verify exact measurements: the strap must fit into the case lugs without forcing. Quality compatible straps from milanostraps.it guarantee precise tolerances and finishes consistent with the sophistication of the case.

A quality leather strap in vegetable tanning or shell cordovan has an average lifespan of 3-5 years with daily wear. Longevity depends on exposure to sunlight, water, skin perspiration, and cleaning frequency. Casati Milano straps are guaranteed for 18 months and can last over a decade with proper maintenance.