Strap for Chronomat Blackbird Big Date Brushed / Black

The lug width of the Breitling Chronomat B01 44 reference A4435910/B811 is 22 mm. This measurement can be verified directly on the watch using a digital calliper, measuring the internal distance between the two case lugs. All 22mm straps in the Milano Straps catalogue are compatible with this reference.

The most suitable materials for the Chronomat B01 44 are hornback alligator for an elegant-sporty combination, vegetable-tanned calf leather for intensive daily wear, ballistic nylon NATO for its instrument-watch character, and vulcanised rubber for sporting or aquatic contexts. The ideal choice depends on intended use and dial colour.

Changing the strap on the Chronomat B01 44 requires a flat-tip spring bar tool, inserted into the lateral hole of the lug to compress the spring bars. It is advisable to work on a soft surface to protect the case finish. If in doubt, entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. Any strap with a 22 mm lug width and standard spring bars is compatible with the Chronomat B01 44 A4435910/B811. Milano Straps offers a selection of handcrafted 22mm straps in various materials, available bespoke or from the ready-to-ship catalogue, with a standard buckle or steel deployant clasp.

The lifespan of a leather strap depends on material quality, frequency of use, and care. A quality vegetable-tanned calf leather strap worn daily typically lasts 18 to 36 months. High-grade alligator can exceed three years if kept away from prolonged exposure to water and perspiration. Casati Milano straps carry an 18-month guarantee against manufacturing defects.