Strap for Chronomat B01 Chronograph 44 Stainless Steel / Blackeye Grey / Croco / Pin

The lug width of the Breitling Chronomat B01 44 AB011510.F581.731P.A20BA.1 is 22 mm. This measurement is taken using a digital calliper between the inner faces of the lugs, at the point where the spring bar sits. The buckle end of the strap typically tapers to 20 mm.

For a 44 mm stainless steel case with a pronounced sporting character, the most appropriate materials are vegetable-tanned alligator leather for formal occasions, smooth or bombé calf leather for everyday wear, and vulcanised rubber for water exposure or physical activity. A NATO nylon strap remains the most historically consistent choice given the model's aeronautical origins. Casati Milano offers bespoke straps with direct leather selection at the Milan atelier.

To replace the strap on the Chronomat B01 44 (leather or rubber configuration), use a fine-tipped spring bar tool to release the 22 mm spring bars seated within the lugs. Work on a soft surface to avoid scratching the case and secure the watch in a holder if possible. The operation takes approximately two minutes and requires no specialist watchmaking tools.

Yes: any strap with a 22 mm attachment width and 20 mm buckle width is compatible with the Breitling Chronomat B01 44 in its leather or rubber strap configuration (not the integrated bracelet variant). Milano Straps offers a curated selection of handcrafted leather, NATO, and rubber straps specifically listed for the 22 mm lug width, with bespoke options available through the Casati Milano atelier.

The lifespan of a leather strap depends on the material, tanning process, and frequency of use. A high-quality vegetable-tanned alligator strap, used daily and maintained properly (avoiding direct water exposure, conditioning every 3–4 months), can last between 3 and 6 years while retaining structural integrity. Smooth calf leather typically lasts 2–4 years. Shell cordovan, owing to its dense fibre structure, tends to outlast both and develops a distinguished patina over time.