Strap for Railmaster Omega Co-Axial Master Chronometer 40 Stainless Steel / Blue / NATO

The lug width of the Railmaster 220.12.40.20.03.001 is 20mm. This width is specific to this model and allows no variation: always measure from wall to wall of the spring bar slot using a digital caliper to ensure perfect strap compatibility.

For the Railmaster 220.12.40.20.03.001 we recommend alligator in dark tones (black brown, anthracite grey) for a formal look, or vegetable-tanned calf for those seeking a natural patina over time. Heavy canvas NATO is ideal for sports and casual contexts. Always in organic colors: cognac brown, stone grey, pure black.

The Railmaster uses removable spring bar attachments. Insert a spring bar tool into the spring bar slot, press downward to release the elastic pin, remove the old strap. Insert the new strap into the lugs and press the elastic pin back until it clicks into place. If unfamiliar with the procedure, Casati Milano atelier can handle the change during an appointment visit.

Yes, provided they strictly respect the 20mm lug width. On milanostraps.it you will find selected artisanal straps, customizable in leather, color, initials and thread color. Avoid undersized or oversized straps: the fit on this Omega case is precise and tolerates no play.

A quality alligator or calf strap lasts 3-5 years with daily use and routine maintenance (monthly cleaning, avoiding water). Shell cordovan resists up to 7 years due to its density. Durability depends on humidity exposure, heat and cleaning frequency. Casati Milano atelier guarantees 18 months on custom-made straps.