Omega · Railmaster

Strap for Railmaster Omega Co-Axial Master Chronometer Small Seconds 38 Stainless Steel / Beige Gradient / Bracelet

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference235.10.38.20.13.001 (aka: 23510382013001)
FamilyRailmaster
MovementOmega caliber 8804 hours, minutes, small seconds | chronometer, co-Axial escapement
Year2025
CaseStainless Steel

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Railmaster 235.10.38.20.13.001 (aka: 23510382013001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Railmaster 235.10.38.20.13.001 (aka: 23510382013001), seen from the bench

The Railmaster represents the modern reissue of the Omega collection dedicated to environments with strong magnetic fields. It is equipped with the automatic caliber 8804 with co-axial escapement and chronometer certification, offering indication of hours, minutes and small seconds. The case features 20mm lugs for the strap.

Frequently asked questions

What is the lug width of the Omega Railmaster 235.10.38.20.13.001?

The lug width is exactly 20mm. This width is proportionate to the 40mm case and ensures visual harmony. Before ordering a strap, verify by measuring the distance between the lugs on the case itself.

What is the best material for a Railmaster strap?

Vegetable-tanned alligator is the most authentic choice—the regular grain complements the satin case and the leather develops a natural patina over time. Tuscan calf is an elegant alternative in dark tones. For intensive daily wear, shell cordovan offers superior density and durability.

How do you change the strap on the Railmaster?

The Railmaster uses standard lugs with <a href="/pages/termine-glossario/deployante">deployante</a> (spring-bar buckle). To change the strap: remove the original bracelet by acting on the locking pin located on the sides of the case, then insert the new strap by aligning the lugs to the seats. It is not necessary to disassemble the movement.

Can I use an aftermarket strap from another brand on my Railmaster?

Yes, as long as it is compatible with a 20mm lug width. Many high-end Italian manufacturers produce straps in this size. We recommend always verifying the reference 235.10.38.20.13.001 with the seller to rule out incompatibilities due to model variations.

How long does a leather strap last on a daily-worn Railmaster?

A quality artisanal alligator or shell cordovan strap lasts 4-6 years under normal conditions. Vegetable tanning accelerates visible patina development but does not compromise structural resistance. Wear occurs mainly at the bend points and friction areas with wrist skin. Light maintenance (cleaning, annual conditioning) significantly extends the strap's lifespan.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only