Strap for Montbrillant 01 Red Gold / Mercury Silver / Calf

The lug width of the Breitling Montbrillant RB013012.G710.428X is 20mm. This measurement should be taken with a digital calliper across the inner distance between the two lugs at the strap attachment point. On 18k red gold cases, manufacturing tolerances may cause a variation of 0.2–0.3mm from the nominal value.

For an 18k red gold case such as the Montbrillant RB013012.G710.428X, the most harmonious materials are Hornback alligator in bordeaux or cognac with a polished finish, vegetable-tanned box-calf leather, and Horween shell cordovan. All three develop a natural patina over time and complement the warm chromatic temperature of red gold without overpowering it.

The strap on the Montbrillant RB013012.G710.428X is replaced using a pointed spring bar tool to release the internal spring within the lug. It is advisable to work on a soft surface to protect the 18k red gold case from scratches. The procedure takes approximately two minutes and requires no specialised tools, though a watchmaker or experienced strap maker can carry it out without any risk to the lugs.

Yes: any strap with a 20mm attachment width is technically compatible with the Breitling Montbrillant RB013012.G710.428X. Milanostraps.it offers handcrafted straps in alligator, calf leather, shell cordovan and other materials, all produced with precision-finished ends and lug thickness calibrated to ensure a correct fit without lateral stress on the case.

The lifespan of a leather strap depends on the material, maintenance and frequency of wear. A quality alligator strap, kept away from excessive moisture and perspiration, typically lasts 3–5 years with regular use. Shell cordovan, thanks to the dense fibre of the cordovan layer, can exceed 5 years. Vegetable-tanned box-calf, being more porous, benefits from a nourishing cream every 3–4 months to maintain structural integrity. Casati Milano provides an 18-month guarantee against manufacturing defects on all its straps.