Strap for Navitimer B01 Chronograph 43 Stainless Steel / Black / Boutique Edition

The lug width of the Breitling Navitimer AB01381C1B1A1 is 22mm. This measurement should be taken with a digital calliper between the inner surfaces of both lugs, at the point of attachment to the case horn. All compatible straps must specify 22mm as their attachment width.

The ideal choice depends on the context. For everyday and sport use, a premium nylon NATO or a vegetable-tanned calf leather strap in tobacco brown best complements the aeronautical heritage. For formal occasions, a matte-grain Louisiana alligator strap in black or midnight blue paired with a steel buckle is the most coherent option for a 43mm case housing the in-house B01 calibre.

Changing the strap requires a fine-tipped springbar tool to compress the spring bars seated within the lugs. Work on a soft surface to protect the caseback and lug surfaces from scratches. The Navitimer lugs have a slight inward curve: ensure the replacement strap features curved ends for a precise, gap-free fit against the case.

Yes. Any strap with a 22mm attachment width is technically compatible, provided the ends respect the curvature of the original lugs. Milano Straps offers handcrafted straps in alligator, calf leather, shell cordovan and nylon, specifically finished for 43mm chronographs, with contrast stitching and edge finishing available bespoke at the Casati Milano atelier.

Longevity depends on the leather type and conditions of wear. A vegetable-tanned calf strap used daily averages 18–24 months; Louisiana alligator, thanks to the resilience of its scale structure, can exceed 3–4 years with routine maintenance. Prolonged exposure to perspiration, water and UV radiation accelerates degradation. Rotating between two straps and applying a nourishing leather conditioner every 3–4 months is recommended.