Strap for Premier Heritage B21 Chronograph Tourbillon Willy Breitling

The Breitling Premier LB2120171C1P1 has a lug width of 20mm. This can be confirmed by measuring the gap between the two lugs with a millimetre ruler or a springbar tool gauge: the free space between the attachment points should measure exactly 20mm. This is a standard width compatible with a wide range of quality aftermarket straps.

Given the platinum case and tourbillon movement, the most appropriate strap is a vegetable-tanned alligator, ideally with a smooth finish and tonal stitching. The Belly or Hornback scale grain complements the understated luminosity of platinum particularly well. Shell cordovan is an excellent alternative for those seeking a more austere, artisanal profile.

The strap is removed using a springbar tool, inserting the forked tip into the lug recess to release the springbars. Given the value of the platinum case, it is strongly advisable to work on a soft surface and, if inexperienced, to entrust the operation to a watchmaker or specialist atelier such as Casati Milano, to prevent scratching the lugs.

Yes. Any standard 20mm strap is technically compatible, provided the springbars are of the correct diameter (typically 1.5mm). Milanostraps.it offers a curated selection of handcrafted 20mm straps designed for watches of this calibre, available in alligator, calf leather, shell cordovan and technical materials.

A quality leather strap worn daily typically lasts between 18 and 36 months. Using a deployant clasp significantly reduces mechanical stress on the buckle holes, extending the strap's lifespan. Vegetable-tanned alligator develops a characterful patina over time, whilst shell cordovan is among the most wear-resistant leather options available for long-term use.