Strap for Breitling Chronomat Automatic GMT 40 NFL Minnesota Vikings Edition

The lug width of the Breitling Chronomat 40 GMT (ref. A32398C31Q1A1) is 20mm. This measurement is taken using a digital calliper positioned between the two lugs at the strap attachment point, measuring the internal distance from side to side. All standard 20mm straps with straight or slightly curved ends are compatible with this reference.

Given the Chronomat 40 GMT's instrumental heritage, the most fitting strap options are: padded alligator with vegetable tanning (for a formal-sports aesthetic), smooth racing-style calf leather with contrast stitching (for a motorsport feel), vulcanised rubber with a transverse groove texture (for aquatic or sporting use), and ballistic nylon NATO (for maximum lightness and aviation authenticity). A brushed steel deployant clasp is recommended for any leather variant.

The strap on the Chronomat 40 GMT is secured by standard 20mm spring bars housed within the integrated lug structure. To replace it, use a springbar tool or a fine-tipped fork tool to compress the spring bars and release the existing strap. No specialist watchmaking equipment is required; the operation can be completed in a few minutes provided the correct tool is used to avoid scratching the case or lugs.

Yes. The standard 20mm lug width makes the Chronomat 40 GMT compatible with a wide range of quality aftermarket straps. Milanostraps.it offers a curated selection of handcrafted straps in alligator, calf leather, shell cordovan and rubber, as well as NATO straps, all available either made to order or as ready-to-ship configurations with straight or gently curved ends to suit the lug profile.

The lifespan of a leather strap depends on the material, tanning method and frequency of use. A quality vegetable-tanned alligator strap, used regularly but not daily, will retain its structural and aesthetic integrity for 3 to 5 years. Shell cordovan, owing to its dense and compact fibre structure, is among the most durable options and can exceed 5 years with periodic conditioning. Calf leather typically lasts 2 to 4 years but is more economical to replace. Casati Milano provides an 18-month warranty against manufacturing defects on all handcrafted straps.