Strap for Speedmaster 57 Co-Axial Stainless Steel / Black / Bracelet

The lug width of the Speedmaster '57 331.10.42.51.01.001 is 20mm. This measurement is specific to this model and determines strap compatibility. You can verify it by inserting a digital caliper between the lugs of the steel case.

The choice depends on use: dark brown or black alligator with vegetable tanning offers formal elegance; full-grain calf is versatile and develops a beautiful patina over time; shell cordovan is water-resistant with natural lustre; NATO remains appropriate for pure sports use. We recommend personalized consultation at Casati Milano.

The strap is changed by removing the spring bars from the case using a specialized tool. Push the spring bar downward, extract it, and reposition it on the new strap. If you are not experienced, we recommend having the change performed at an authorized Omega retailer or at the Casati Milano atelier.

Yes, it is fully compatible with aftermarket straps with a 20mm lug width. High-quality leather, calf, NATO, and rubber straps work perfectly. Milanostraps.it offers a complete collection of 20mm straps for this reference.

A quality leather strap (alligator, calf, shell cordovan) with vegetable tanning lasts an average of 3-5 years with regular use, depending on frequency of wear and climatic conditions. Leather fears prolonged sweat exposure and direct sunlight. A Casati Milano strap includes an 18-month warranty and can be restored at the atelier to extend its life.