Strap for Seamaster Aqua Terra 150M Co-Axial 36.2 Railmaster / Brown Alligator

The lug width of the Railmaster 2804.52.37 is 19 millimeters. This dimension is calculated by measuring the internal distance between the two spring bar attachments. You can verify it with a digital caliper by measuring it directly on the watch case, between the anchor points where the strap rests.

The choice depends on your style. Dark brown or black alligator offers formal elegance while maintaining the serious character of the model. Italian calf allows you to observe the natural aging of the leather over time. For a functional and contemporary approach, vulcanized rubber or woven NATO straps are excellent, emphasizing the Railmaster's tool watch DNA.

Use a spring bar tool to gently disengage the spring bar from both sides of the case. Insert the flat tip of the tool into the small holes at the ends of the lugs and press toward the center to release the spring. Remove the old strap and insert the new one in the same way, ensuring the spring bar clicks properly into position.

Yes, provided the strap is designed for a 19 millimeter lug width. Quality artisanal straps, made in premium leathers such as alligator, calf, or shell cordovan, ensure total compatibility and often offer superior construction quality to original Omega straps. Always verify that the width is correct before purchasing.

A quality Italian leather strap, hand-crafted, typically lasts between 4 and 7 years of regular use, depending on moisture exposure and frequency of wear. More robust leathers such as shell cordovan or alligator resist longer than soft calf. Proper maintenance—avoiding prolonged moisture and periodically applying a protective balm—significantly extends the life of the strap.