Strap for Seamaster Aqua Terra 150M Co-Axial 39.2 Railmaster Yellow Gold / Brown Alligator

The lug width of the Railmaster 2603.52.37 is 20 mm. This measurement represents the precise distance between the two lugs of the case where the strap sits. It is essential for purchasing compatible straps without requiring adjustments to buckles or keepers.

For a Railmaster 2603.52.37 in yellow gold, we recommend Havana brown alligator for maximum chromatic harmony, or shell cordovan with vegetable tanning that develops a caramel patina pairing naturally with gold. For a sportier version, dark blue calf with a yellow gold deployant offers sophisticated contrast while maintaining elegance.

The strap is replaced using a spring bar tool to remove the lug pins. Position the watch horizontally, insert the sharp tip of the tool into the small hole located beneath the lug, gently remove the spring bar pin, slide the old strap outward, insert the new strap, and reintroduce the spring bar pin until you hear the click.

Absolutely yes. Provided the strap has been made for a 20 mm lug width, you can mount artisanal aftermarket straps. Compatibility is guaranteed by the lug width, not by the watch brand. An artisanal alligator or cordovan strap elevates the overall experience of your Railmaster.

A quality leather strap (alligator, cordovan, calf with vegetable tanning) maintains structural integrity for 5–7 years of regular use, provided it is properly cared for. Leather fears prolonged moisture and excessive heat: we recommend allowing the strap to air dry after water exposure and avoiding temperatures above 35°C. Minimal maintenance—cleaning every six months—significantly extends durability.