Strap for Premier Heritage B21 Chronograph Tourbillon Red Gold / Black - Rainbow

The lug width of the Breitling Premier RB21206A1B1P1 is 20mm. To confirm this measurement, use a digital calliper and measure the internal distance between the two lugs at their widest point, flush against the case. This is a standard dimension across the Premier family and opens up a broad selection of quality aftermarket straps.

For the Premier RB21206A1B1P1 in red gold, a Louisiana or hornback alligator strap in vegetable-tanned leather is the first choice: the natural grain develops a patina that harmonises with the warm tone of red gold. Shell cordovan is an excellent alternative for those who prefer a uniform surface. In both cases, a deployant clasp in red gold or gold PVD completes the metal pairing without compromise.

To replace the strap on the Premier RB21206A1B1P1, use a fine-tipped spring bar tool. Insert the tip into the spring bar slot on the inner side of the lug, compress the spring bar, and slide it out. Repeat on the opposite lug. The lugs on this model have a downward-curved profile: ensure the new strap follows that curvature naturally without tension in the first few centimetres. If you are unfamiliar with the tool, consult a watchmaker or the Casati Milano atelier.

Yes. Any standard 20mm strap is compatible with the Breitling Premier RB21206A1B1P1, provided the end length suits the curved lug profile. Milanostraps.it offers a curated selection of handcrafted 20mm straps in leather, alligator and shell cordovan by Casati Milano, with bespoke customisation available on request.

Longevity depends on material and care. A vegetable-tanned alligator strap, properly conditioned and kept away from excessive moisture, typically lasts 3–5 years with daily wear. Shell cordovan, due to its dense fibre structure, tends to last longer while developing a distinctive patina over time. A quality calfskin strap averages 1–2 years. Casati Milano offers an 18-month guarantee against manufacturing defects.