Strap for Chronomat 40 GMT Stainless Steel / Erling Haaland / Rubber

The lug width of the Breitling Chronomat 40 GMT (ref. P323982A1F1S1) is 20 mm. This measurement is taken with a digital calliper inserted between the two lugs at the narrowest point, level with the spring bars.

For a meteorite dial paired with a platinum and stainless steel case, an alligator strap in vegetable-tanned leather — midnight blue or tobacco brown — offers the most coherent aesthetic and material match. Shell cordovan with its smooth surface enhances the metallic character of the case. For sporting use, vulcanised rubber is the most technically appropriate choice.

The strap is replaced by removing the spring bars from the case lugs using a dedicated spring bar tool with a fine tip. The Chronomat 40 GMT has robust lugs: care should be taken not to scratch the platinum case during the operation. If in doubt, it is advisable to entrust the task to a watchmaker or the Casati Milano atelier.

Yes, all straps with a 20 mm attachment width are compatible with this model. milanostraps.it offers a selection of handcrafted straps in various materials — alligator, calf leather, shell cordovan, rubber, NATO — made specifically for sport-luxury watches with a 20 mm lug width such as the Chronomat 40 GMT.

The lifespan of a leather strap depends on the material and care routine. A quality vegetable-tanned alligator strap, with moderate daily use and regular maintenance (nourishing cream every 2–3 months, kept away from water), typically lasts between 2 and 4 years. Shell cordovan, owing to its dense fibre structure, tends to last longer whilst developing a distinctive patina. Casati Milano provides an 18-month guarantee against manufacturing defects.