Strap for Breitling Chronomat Automatic GMT 40 NFL Las Vegas Raiders Edition

The Breitling Chronomat 40 GMT A32398B91B1A1 features a 20mm lug width, measured between the inner case lugs. The standard taper closes at 18mm. Any 20mm strap with an 18mm buckle end is compatible with this reference.

The choice depends on intended use. For professional or formal settings, a vegetable-tanned alligator strap complements the case finishing and develops a distinguished patina over time. For sporting or marine use, vulcanised rubber or ballistic nylon NATO straps offer durability without compromising aesthetics. Shell cordovan is the premium choice for formal occasions.

Strap replacement requires a springbar tool — a forked-tip instrument that compresses the spring bars housed within the case lugs. Insert the tip into the lug slot, compress the spring bar, and slide the strap free. Exercise care to avoid scratching the case surfaces. The operation takes only a few minutes and can be performed independently.

Yes. Any strap with a 20mm lug end and 18mm buckle end is technically compatible. Casati Milano crafts bespoke aftermarket straps proportioned specifically for the Chronomat 40, with taper and length optimised for the model's wider lug geometry. Materials are selected to match the construction quality of the watch itself.

Longevity depends on material, usage, and maintenance. A high-quality vegetable-tanned alligator strap, with moderate daily wear and periodic conditioning, will last three to five years while retaining structural and aesthetic integrity. Shell cordovan is the most durable option due to its dense fibre structure. Exposure to moisture or marine environments significantly reduces leather lifespan; rubber or NATO straps are recommended in such conditions.