Strap for Breitling Chronomat Automatic GMT 40 NFL Houston Texans Edition

The lug width of the Breitling Chronomat 40 GMT A32398D61B1A1 is 20mm. To measure it accurately, use a digital calliper to gauge the inner distance between the two lugs on the case — do not rely solely on the original strap width, which may appear slightly wider due to its curved profile.

For the Chronomat 40 GMT, a vegetable-tanned calfskin or matte alligator strap pairs exceptionally well with the 40mm steel case, enhancing its instrumental character with a refined, artisanal touch. For sport use or travel, a ballistic NATO or vulcanised rubber strap delivers durability and practicality without aesthetic compromise.

The strap on the Chronomat 40 GMT is replaced using a springbar tool inserted into the side hole of each lug to compress the fixing spring bar. The lugs on this model are standard and accessible; it is advisable to work on a soft cushion to protect the case from scratches. If in doubt, a watchmaker or the Casati Milano atelier can complete the swap in minutes.

Yes, any aftermarket strap with a 20mm attachment is compatible with the Breitling Chronomat 40 GMT A32398D61B1A1. Milano Straps offers an artisanal selection in various leathers and technical materials, all crafted for this lug width, with a deployant clasp option available on request.

The lifespan of a leather strap depends on the quality of the tanning process and daily use. A quality vegetable-tanned calfskin strap typically lasts 2–4 years with regular care. Alligator and shell cordovan, thanks to the density of their fibres, tend to last considerably longer and develop a distinctive patina over time. Avoiding prolonged exposure to water and perspiration significantly extends the strap's service life.