Strap for Montbrillant 01 Stainless Steel / Mercury Silver / Calf

The lug width of the Breitling Montbrillant AB013012.G735.428X is 20 mm. This measurement is taken with a calliper between the two lugs of the case, at the narrowest point between the lug and the case. It is one of the most common dimensions in Swiss watchmaking tradition, ensuring a wide availability of quality straps.

For the Montbrillant with its slate grey dial, a Hornback alligator strap in black or tobacco brown with contrasting stitching best complements the instrument-grade character of the dial. Alternatively, a vegetable-tanned calf leather strap in natural tan develops an authentic patina over time. A NATO strap in RAF colours is the most coherent choice given the model's aviation heritage.

Strap replacement on the Montbrillant AB013012.G735.428X is carried out by removing the spring bars connecting the strap to the case lugs, using a dedicated spring bar tool. The operation is fully reversible and does not require a watchmaker, provided that 20 mm spring bars of the appropriate diameter for Breitling lug depth are used.

Yes. Any strap with a 20 mm lug width is technically compatible with the Montbrillant AB013012.G735.428X. On milanostraps.it, a curated selection of handcrafted 20 mm straps — in leather, NATO, and rubber — is available, designed to fit Breitling lugs precisely without lateral play or undue tension on the spring bars.

The lifespan of a leather strap depends on the type of leather, frequency of use, and the wearer's care. A quality vegetable-tanned calf strap worn daily and kept away from moisture typically lasts 18 to 36 months. A high-grade alligator strap, properly maintained, can exceed 4 to 5 years. Casati Milano straps carry an 18-month warranty against manufacturing defects.