Strap for Colt 36 Pearl Diamond / Rubber / Pin

The lug width of the Breitling Colt A7438911/A771/237S/A16S.1 is 18mm. This measurement should be taken with a calliper at the innermost point between the lugs, flush against the case, rather than at the outer edge of the lug where tolerances may vary.

For the Colt 36mm, the most suitable materials are vegetable-tanned calfskin for daily wear — owing to the patina it develops over time — and alligator leather for formal contexts. For sport or water-adjacent use, a nylon NATO or vulcanised rubber strap is the most functionally appropriate choice. In all cases, the 18mm lug width requires straps specifically made to that measurement.

To replace the strap, use a fine-tipped spring bar tool or a dedicated watch screwdriver. Compress the spring bar housed within the case lugs, remove the strap, and insert the new one, ensuring the spring bar clicks securely into the lug holes before releasing pressure. It is advisable to work on a soft surface to prevent scratching the stainless steel case.

Yes. Any strap with an 18mm attachment width is technically compatible with the Breitling Colt 36mm, provided the spring bars are of the correct length for this model's lug depth. It is also important to verify the curvature radius of the strap at the attachment point, which should follow the case profile to ensure a clean fit without lateral gaps.

Longevity depends on the type of leather and usage conditions. A vegetable-tanned calfskin strap worn daily and not regularly exposed to water typically lasts between 18 and 36 months before showing structural wear. Shell cordovan offers greater durability, often exceeding four years. Regular conditioning with a neutral leather cream and rotating between multiple straps will significantly extend the leather's service life.