Strap for Chronomat 40 GMT Six Nations England

The Breitling Chronomat 40 GMT (ref. A323985B1A1A1) has a lug width of 20mm. This measurement refers to the internal distance between the two lugs at the point where the strap meets the case, and is the key specification for selecting a compatible replacement strap. It can be verified using a digital calliper placed at the lug gap.

For the Chronomat 40 GMT, the most appreciated options are vegetable-tanned alligator for formal wear, shell cordovan for those who value a strap that develops character over time, and smooth calf leather or vulcanised rubber for sportier contexts. Regardless of material, the strap must match the 20mm lug width and feature a buckle or deployant clasp proportionate to the 40mm case diameter.

Strap replacement on the Chronomat 40 GMT is carried out using a fine-tipped spring bar tool. Compress the spring bars inward toward the lug interior, then slide the strap free. To reattach, hook one end of the spring bar into the lug, compress the opposite end and engage it on the other side. The procedure takes only a few minutes and requires no specialist tools, though working on a soft surface is advisable to protect the case finishing.

Yes, the aftermarket offers a wide range of straps compatible with the 20mm lug width of the Chronomat 40 GMT. Milanostraps.it stocks a curated selection of handcrafted straps in alligator, calf leather, shell cordovan, NATO nylon and rubber, all produced with stitching profiles and thickness calibrated to suit this reference. Artisanal construction ensures a precise fit and an aesthetic consistent with the watch's quality.

The lifespan of a leather strap depends on the material, frequency of use and maintenance routine. A quality alligator strap worn regularly but kept away from moisture will retain its structural and aesthetic integrity for 3 to 5 years. Shell cordovan, owing to the density of its fibres, often lasts longer and develops a patina that enhances its appeal over time. Periodic conditioning with solvent-free leather cream and rotating between multiple straps are the most effective measures to extend strap life. Casati Milano straps carry an 18-month manufacturing warranty.