Strap for Chronomat B01 42 NFL Dallas Cowboys / Rouleaux

The lug width of the Breitling Chronomat B01 42 AB01342B1C1A1 is 22mm. This measurement refers to the internal distance between the two lugs of the case, i.e. the strap attachment point. To verify it independently, use a digital calliper to measure the internal gap between the lugs at the point of contact with the strap.

For the Breitling Chronomat B01 42, the most suitable materials are premium perforated calf leather in a Rally style — historically consistent with the model's aviation and motorsport heritage — and vegetable-tanned alligator for more formal settings. Vulcanised rubber is ideal for intensive sports use, while woven nylon NATO straps suit a classic tool-watch aesthetic. In all cases, the attachment width must be 22mm.

The strap on the Breitling Chronomat B01 42 is replaced via the spring bars connecting the strap to the case lugs. Using a fork-tipped spring bar tool, compress the ends of the bar and slide the strap free. The operation is straightforward and does not require a watchmaker, provided the correct tool is used to avoid scratching the stainless steel case.

Yes, there are many aftermarket straps compatible with the Breitling Chronomat B01 42, provided they feature a 22mm attachment width and use standard spring bars. Milanostraps.it offers a curated selection of handcrafted straps in various materials — calf leather, alligator, NATO, rubber — made specifically for this lug width, with customisable finishes and stitching.

The lifespan of a leather strap depends on the quality of the hide, the tanning process and daily use. A standard-quality calf strap typically lasts 1–2 years with regular wear. A vegetable-tanned alligator strap, properly cared for with specific leather conditioners and kept away from prolonged moisture and perspiration, can last 4–6 years or more. Casati Milano handcrafted straps carry an 18-month warranty against manufacturing defects.