Strap for Breitling Chronomat Automatic GMT 40 NFL Denver Broncos Edition

The lug width of the Breitling Chronomat 40 GMT (ref. A32398C81O1A1) is 20 mm. This measurement refers to the internal distance between the two lugs and is the essential parameter for selecting a compatible strap, whether original or aftermarket.

The ideal choice depends on intended use and aesthetic preference. For formal occasions, an alligator strap with a matte finish and deployant clasp complements the case construction superbly. For everyday wear, vegetable-tanned calfskin develops a distinctive patina over time. A heavy nylon NATO strap is the preferred option for those seeking lightness and consistency with the model's aeronautical heritage.

The strap is removed using a fine-tipped spring bar tool. Apply gentle pressure to the end of the spring bar until it disengages from the lug, then repeat on the opposite side. Fitting the new strap is the reverse process: insert one end of the spring bar into the lug, compress, and engage the other side. Dedicated tools are strongly recommended to avoid scratching the case.

Yes. Any strap with a 20 mm lug width is technically compatible with the Chronomat 40 GMT. Milanostraps.it offers a curated selection of handcrafted straps in leather, alligator, shell cordovan and NATO textile, all manufactured to be compatible with the standard Breitling 20 mm spring bars.

Longevity depends on leather quality, maintenance and frequency of use. A quality vegetable-tanned calfskin strap worn daily typically lasts between 18 and 36 months. Shell cordovan and alligator, owing to their denser fibre structure, offer greater durability. The use of a deployant clasp significantly reduces stress on the leather and extends strap life considerably.