Strap for Railmaster Omega Co-Axial Master Chronometer 40 Stainless Steel / Grey / Bracelet

The lug width of the Railmaster 220.10.40.20.01.001 is 20mm. This width is specifically calibrated for the proportions of the 40-millimetre case and tonneau geometry. You can verify it by measuring with a digital caliper the distance between the inner edges of the lugs on the case.

The choice depends on your use case. For formal occasions, alligator with vegetable tanning in black or burgundy amplifies the elegance of the case. For everyday versatility, shell cordovan calf in burgundy develops an extraordinary patina over time. If you prefer a sporty profile, a wool-patterned NATO or structured FKM rubber enhance the technical character of the model.

Position the watch on a soft cloth with the strap facing upward. Using a spring bar removal tool (or a toothpick), gently push a spring bar from the outside toward the inside of the lug. Once the spring bar is extracted, the old strap separates from the case. Insert the new spring bar into the new strap, align the holes and push the spring bar until it locks completely.

Yes, as long as it has an exact lug width of 20mm. Any strap with this width is compatible with the 220.10.40.20.01.001. We recommend verifying the quality of the leather and finishing: a handcrafted strap with vegetable tanning ensures controlled aging and superior longevity compared to industrial alternatives.

A quality leather strap with vegetable tanning has a useful life of 3-5 years with intensive daily use. Durability depends on maintenance, sun exposure and humidity. Handcrafted straps from Casati Milano, made in vegetable-tanned leather, are guaranteed for 18 months and age by developing an authentic patina that increases aesthetic value over time.