Strap for Premier Heritage B15 Duograph 42 Red Gold / Black

The Breitling Premier RB1510251B1P1 has a lug width of 20mm. This measurement is consistent across the entire 42mm Premier family and should be taken with a calliper at the innermost point between the lugs, directly against the case, to ensure a precise strap replacement.

For a rattrapante chronograph in 18-carat red gold, the most coherent choice is an alligator belly or hornback strap in tobacco, cognac or bordeaux tones. Vegetable-tanned calf leather is a sound everyday alternative that develops a rich patina over time. Shell cordovan in black or bordeaux emphasises the instrumental character of the Caliber B15.

The strap is removed using a strap tool with a forked tip, inserted between the lug and the spring bar. On a red gold case, it is advisable to protect the lugs with a soft cloth or masking tape during the operation. The 20mm spring bar is then transferred to the new strap and reinserted into the lugs.

Yes. Any strap with a 20mm lug width and standard spring bars is compatible. Milano Straps offers a curated selection of handcrafted 20mm straps — alligator, calf, shell cordovan and technical materials — designed to fit the converging lugs of the Premier without altering its original geometry.

A quality leather strap — alligator or vegetable-tanned calf — typically lasts between 18 and 36 months with regular wear. The red gold case does not accelerate strap deterioration as it does not come into direct contact with the leather. The primary factor is perspiration: rotating between two straps and allowing the leather to dry after each use will significantly extend its service life.