Strap for Seamaster Master Co-Axial 39.5 Paris Edition Stainless Steel / Grey / Alligator

The lug width of the Seamaster 511.13.40.20.06.001 is 20mm, measured between the horizontal pins that attach the strap to the lugs of the case. This measurement requires a specific selection of straps, incompatible with more common standard widths such as 18mm, 19mm or 22mm.

The choice depends on the intended use. For formal elegance, we recommend dark brown calf leather or vegetable-tanned alligator. For sporting and aquatic contexts, a NATO strap in canvas or vulcanized rubber enhances the 300m water resistance and ceramic bezel. Shell cordovan is ideal for those seeking a patina that evolves over time.

Position the watch on a soft cloth. Use a spring bar tool to gently push the pin inward, creating space to remove the strap. Insert the new strap by aligning one pin first, then push the second pin until you hear it click into place. Verify that both pins are completely inserted into the lugs.

Yes. MilanoStraps offers a collection of 20mm straps in various materials (leather, NATO, rubber) compatible with your Seamaster. All are customizable in lengths, initials and stitching thread, with fast shipping available.

A quality leather strap, with vegetable tanning or shell cordovan, has an average lifespan of 3-5 years with daily use, thanks to the patina that protects it over time. Calf and alligator last 2-3 years under normal conditions. Durability depends on humidity, sun exposure and regular maintenance. NATO and rubber straps exceed 5 years if not exposed to extreme temperature fluctuations.