Strap for Chronomat 40 GMT Stainless Steel / Grey / Rouleaux

The Breitling Chronomat 40 GMT A32398101M1A1 features a lug width of 20mm. This measurement can be verified using a digital calliper placed internally between the two case lugs. It is the standard lug width for all 40mm Chronomat models and is fully compatible with 20mm aftermarket and bespoke straps.

For the Breitling Chronomat 40 GMT, a vegetable-tanned alligator strap is the most refined choice for formal settings, as its natural grain develops a rich patina over time. For everyday sporting use, grained calf leather or vulcanised rubber straps are more appropriate. For enhanced security, a steel deployant clasp is the most technically coherent closure for this instrument.

The strap on the Breitling Chronomat 40 GMT is secured by standard 20mm spring bars. Using a spring bar tool or a fine-blade screwdriver, compress the spring bars within the lugs and slide the strap outwards. No specialist tools are required, though it is advisable to work on a soft surface to avoid scratching the case or lugs.

Yes, any strap with a 20mm attachment is compatible with the Breitling Chronomat 40 GMT. Milanostraps.it offers a dedicated selection of handcrafted 20mm straps in alligator, calf leather, shell cordovan, NATO, and rubber, all fitted with standard spring bars. For bespoke work tailored to the specific geometry of the case, Casati Milano provides sartorial consultation by appointment.

The longevity of a leather strap depends on the quality of the tanning process, frequency of use, and maintenance. A high-quality vegetable-tanned alligator strap, with regular use and protection from excessive moisture, will maintain its structural integrity for 3 to 5 years. Calf leather straps typically last 2 to 3 years. Casati Milano straps carry an 18-month guarantee against manufacturing defects and include specific care instructions.