Strap for Chronomat 44 Stainless Steel / Rose Gold / Golden Sun Diamond / Croco

The lug width of the Breitling Chronomat B01 44 CB0110AA.H548.739P is 22mm. This measurement is taken internally between the two lugs using a calliper placed directly against the case metal. Respecting this dimension when selecting an aftermarket strap is essential to ensure a precise and secure fit.

For the two-tone rose gold and steel variant, a glossy alligator strap in cognac or dark brown is the most coherent choice: it enhances the warmth of the rose gold and visually complements the structured bezel. Alternatively, a vegetable-tanned calf leather strap develops a natural patina over time. For sporting or marine environments, a vulcanised rubber strap offers optimal technical performance.

The strap on the Chronomat B01 44 is replaced via the spring bars housed within the case lugs. It is advisable to use a dedicated fork tool or spring bar tool to avoid scratching the rose gold surfaces. The operation takes approximately two minutes for an experienced watchmaker; with the right tools, it can also be carried out independently on a soft surface to protect the case.

Yes, all straps with a 22mm straight-end attachment are compatible with the Chronomat B01 44. Milano Straps offers a selection of handcrafted straps in various materials — alligator, calf leather, rubber, NATO — produced to precise measurements for an optimal fit on Breitling lugs. Selection can be made online or through a personalised consultation at the Casati Milano atelier.

The longevity of a leather strap depends on the quality of the hide, frequency of use, and exposure to perspiration and water. A high-grade alligator strap, with regular but non-intensive use, can last between three and five years whilst retaining its aesthetic integrity. Vegetable-tanned calf leather develops a distinctive patina over time due to its denser fibre structure. It is advisable to rotate between multiple straps and store them away from direct heat sources.