Strap for Chronomat 40 GMT Stainless Steel / Blue / China

The Breitling Chronomat 40 GMT A323981A1C1A1 takes a strap with a lug width of 20mm. This measurement refers to the internal distance between the two case lugs at the point where the strap attaches. We recommend verifying this measurement with a calliper before ordering an aftermarket strap, measuring at the narrowest point between the lugs.

The ideal strap for the Chronomat 40 GMT depends on the intended use. Vegetable-tanned alligator with a matte finish suits formal occasions, while vegetable-tanned calfskin develops an authentic patina with daily wear. A technical nylon NATO strap maintains the sporting character of the piece. A deployant clasp in stainless steel is recommended regardless of material, as it balances the weight of the case and ensures a stable fit on the wrist.

The strap is removed using a spring bar tool. Insert the tip between the lug and the strap end, compress the spring bar and slide the strap free. Repeat on the opposite side. We recommend working on a soft surface to avoid scratching the case, and replacing the spring bars if they show signs of wear or fatigue.

Yes, any strap with a 20mm lug width is technically compatible with the Breitling Chronomat 40 GMT A323981A1C1A1. It is important to ensure that the strap ends are shaped to match the curvature of the Chronomat lugs. Casati Milano handcrafted straps in 20mm are made to precise tolerances to ensure a clean, accurate fit.

The lifespan of a leather strap depends on the material, quality of craftsmanship and conditions of use. A high-quality vegetable-tanned alligator strap, worn daily and kept away from excessive moisture, typically lasts between 2 and 4 years. Vegetable-tanned calfskin may develop a desirable patina over time but is more susceptible to water damage. Casati Milano straps carry an 18-month guarantee against manufacturing defects.