Strap for Breitling Chronomat Automatic GMT 40 NFL Atlanta Falcons Edition

The lug width of the Breitling Chronomat 40 GMT A32398D71B1A1 is 20mm. This measurement is taken at the narrowest point between the lugs, where the spring bar sits. The lugs on this model feature a pronounced curvature, so for an optimal fit it is advisable to use curved-end straps specifically designed for the Chronomat case profile.

The most suitable options for the Chronomat 40 GMT are: square-grain alligator for an elegant and structured look, vegetable-tanned calf leather for those who appreciate developing patina over time, shell cordovan for a dense surface with near-metallic sheen, vulcanised rubber for sporting use, and ballistic nylon NATO to reference the watch's aviation heritage. The ideal choice depends on the context of use and the dial colour.

To replace the strap on the Chronomat 40 GMT, you will need a fine-tipped spring bar tool. Insert the tip into the spring bar slot, compress the spring and slide the strap free from the lug. The operation should be carried out carefully to avoid scratching the stainless steel case — it is recommended to protect the lugs with soft masking tape during the process. Standard 20mm spring bars are compatible with this model.

Yes, the aftermarket offers a range of straps compatible with the 20mm lug width of the Chronomat 40 GMT. It is essential to ensure the strap has curved ends suited to the Breitling lug profile. Milanostraps.it offers a curated selection of handcrafted 20mm straps compatible with this reference, made from selected leathers and available with various buckle or deployant clasp options.

The lifespan of a leather strap depends on the material, frequency of use, and exposure to perspiration and moisture. A quality calfskin strap typically lasts 12 to 24 months with daily wear. Alligator, thanks to the structure of its scales, is more resistant to humidity and can last 2 to 4 years. Shell cordovan is the most durable of the classic leathers. For a sports-oriented chronograph such as the Chronomat, it is advisable to alternate a leather strap with a rubber one during more demanding activities.