Technical Archive

Omega
Railmaster 2503.52.00 (aka: 25035200)— lug 20mm

Omega Railmaster 2503.52.00 (aka: 25035200): 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Seamaster Aqua Terra 150M Co-Axial 39.2 Railmaster / Bracelet

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Omega 2503.52.00 (aka: 25035200)
Lug Width
20 mm

The essential strap measurement.

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Reference

2503.52.00 (aka: 25035200)

Movement

Omega caliber 2403 Hours, Minutes, Seconds | Co-Axial Escapement, Chronometer

The Heritage

The Railmaster reference 2503.52.00 mounts the Omega 2403 caliber with co-axial escapement and chronometer certification. The movement indicates hours, minutes and seconds with the accuracy guaranteed by the co-axial technology. The case features 20mm lugs for the strap.

FAQ

What is the lug width of the Omega Railmaster 2503.52.00?

The lug width of the Railmaster 2503.52.00 is 20mm. This measurement is precise and allows no variation: the strap must fit perfectly between the two spring bars of the case without lateral play.

What is the best strap for the Omega Railmaster 2503.52.00?

The choice depends on your usage. For everyday elegance we recommend cognac alligator or Shell Cordovan; for practicality faithful to the original railway spirit, black rubber or military NATO. Vegetable-tanned leather is the ideal European compromise. All materials must be 20mm lug width.

How do you change the strap on an Omega Railmaster 2503.52.00?

The Railmaster uses standard spring bars. With a dedicated tool (spring bar remover), gently press down one of the two lateral spring bars and the strap releases. Position the new spring bars in the case lugs, then insert the new strap and click until it locks.

What is the most reliable aftermarket strap for the 2503.52.00?

High-quality leather aftermarket straps offer superior value for money compared to original Omega straps. Milano Straps offers customizable straps in vegetable-tanned leather, alligator and Shell Cordovan, all crafted with precise 20mm lug width and 18-month warranty through Casati Milano.

How long does a leather strap last on a watch like the Omega Railmaster?

A high-quality leather strap typically lasts 3-5 years with daily wear, depending on frequency of use, climate and leather type. Vegetable-tanned leather ages beautifully; Shell Cordovan can last up to 7 years. With periodic maintenance and storage in a dry environment, longevity increases considerably.

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 →

By appointment only · Milan

The atelier's website: casatimilano.com