Strap for Railmaster Omega Co-Axial Master Chronometer 38 Stainless Steel / Grey Gradient

The lug width of the Railmaster 235.12.38.20.06.001 is 20mm. This is the internal distance between the two lugs of the case, both vertically and horizontally. Measuring with a digital caliper you will get exactly 20mm; a compatible strap must respect this measurement to the millimeter to ensure correct insertion and no play.

For the Railmaster 235.12.38.20.06.001 we recommend black alligator with grey or white stitching for maximum geometric elegance, or mahogany brown calf leather with vegetable tanning to develop a natural patina over time. If your use is daily and sporty, black FKM rubber with anti-sweat texture is the most functional choice. Grey or navy blue cotton NATO offers versatility and an emotional connection to the military tradition of watchmaking.

Changing the strap on the Railmaster 235.12.38.20.06.001 requires two tools: a spring bar tool (pen with slots at the ends) and a flat surface. Position the watch with the strap facing down, insert the tip of the spring bar tool into the lateral slot of the lug (toward the inside of the case) to compress it, then remove the old strap. Repeat on the other side. To insert the new strap, align the two holes of the lug with the pins, snap the first pin into place, then press the second one until you hear the locking click. Verify that the strap is not twisted.

The Railmaster 235.12.38.20.06.001 comes with an original Omega stainless steel strap with <a href="/pages/termine-glossario/deployante">deployante clasp</a>. It is an Omega standard, not proprietary, so it is compatible with any 20mm aftermarket strap. However, the Omega <a href="/pages/termine-glossario/deployante">deployante clasp</a> is very solid; if you decide to keep it, you can pair it with a leather strap thanks to double bars (one for the strap, one for the <a href="/pages/termine-glossario/deployante">deployante clasp</a>).

A quality leather strap (alligator with vegetable tanning or naturally tanned calf) lasts an average of 4-7 years with daily use, depending on climate conditions and personal wear. Leather fears acidic sweat, constant humidity, and rapid drying. A rubber strap lasts 8-10 years before losing elasticity. Vegetable-tanned calf develops beautifully, building precious patina; alligator remains practically unchanged. The Casati Milano atelier offers an 18-month warranty on all customized straps, covering manufacturing defects.