Strap for Montbrillant 01 Stainless Steel / Mercury Silver / Air Racer

The lug width of the Breitling Montbrillant AB013012.G709.223A is 20mm. This measurement is taken with a digital calliper between the two inner lug surfaces at the strap attachment point. It is the critical specification when ordering any aftermarket strap for this reference.

For the Montbrillant AB013012.G709.223A fitted with the in-house B01 movement, a vegetable-tanned alligator strap with symmetrical Mississippi grain best complements the manufacture calibre. Shell cordovan offers a dense, wax-like surface that develops a rich patina over time. For sport or humid environments, a brushed steel deployant clasp or a technical NATO strap are functionally consistent with the watch's instrumental character.

Strap replacement requires a springbar tool — either a lever or fork type. Compress the springbars housed in the 20mm lugs to release the existing strap, then insert the new strap by seating one end of the springbar first, compressing it, and engaging the opposite lug. Always work on a soft surface to avoid scratching the case. If in doubt, consult a watchmaker or the Casati Milano atelier.

Yes. Any strap with a 20mm attachment width is compatible with the Montbrillant AB013012.G709.223A, provided the springbar length suits the Breitling lug geometry. Milano Straps offers a curated selection of handcrafted 20mm straps in leather, nylon and rubber, all compatible with this reference without structural modification.

Longevity depends on the leather type, tanning method and daily use. A quality vegetable-tanned calf strap, with standard care — avoiding prolonged exposure to water and perspiration, applying leather conditioner every two to three months — will retain structural and aesthetic integrity for two to four years. Shell cordovan, due to its dense fibre structure, tends to outlast most leathers while developing patina rather than deteriorating. Casati Milano straps carry an 18-month manufacturing defect guarantee.