Strap for Constellation Co-Axial 31 Stainless Steel / Red Gold / Brown

The Omega Constellation 123.20.31.20.13.001 has a lug width of 18mm. This measurement represents the horizontal distance between the two spring bars that connect the strap to the case. It is essential to verify this compatibility before purchasing an aftermarket strap, as 18mm is not interchangeable with 16mm, 20mm, or other sizes.

For this dress watch in rose gold and steel, we recommend three options in order of elegance: American alligator with natural grain (visual contrast with the mixed case), vegetable-tanned calf leather (minimalist aesthetics and softness), or bourbon shell cordovan (chromatic depth and patina over time). We advise against sport straps (fabric, NATO) that would contrast with the formal aesthetic of the Constellation.

The procedure requires a specific tool (spring bar tool). Position the watch on a stable surface, identify the two lateral spring bars on the case, insert the tool into the small hole at the base of one spring bar to compress the internal spring, remove the bar from its seat, repeat for the second bar. Once you have removed the bars from the old strap, reinsert them into the new strap ensuring they click correctly into place. If you are not experienced, entrust the task to a qualified watchmaker.

All straps with an 18mm lug width are compatible, regardless of brand. However, to preserve the aesthetic integrity of a watch of this caliber, we recommend artisanal full-grain leather straps (not synthetic) with refined finishes and visible stitching. Avoid straps with excessive thickness (>4mm) that could alter the proportions of the case.

The lifespan depends on the intensity of use and the material. A well-maintained vegetable-tanned calf strap lasts 3-5 years with daily wear; alligator and shell cordovan, having denser fibers, can last 5-8 years. Controlled patina and wear are natural and desirable; if the strap begins to separate from the stitching or develops deep cracks, replacement is necessary. Prolonged exposure to water and heat accelerates aging.