Strap for Navitimer 8 Automatic 41 Blacksteel Prototype

The Breitling AVI M1731410 has a lug width of 21 mm. This is a specific dimension adopted by Breitling on several professional models to ensure correct proportions between the case and the strap. It is essential to select a strap manufactured precisely to 21 mm, as standard 20 mm or 22 mm straps will not fit the lugs correctly.

For the Breitling AVI M1731410, the most suitable materials are vegetable-tanned alligator — for an elegant pairing with natural texture — shell cordovan for a patina that develops character over time, and NATO straps in nylon or perlon for a direct reference to military aviation aesthetics. Vulcanised rubber is the ideal choice for intensive sporting or daily use. The strap width must be strictly 21 mm.

To replace the strap on the Breitling AVI M1731410, a spring bar tool with a fine tip is required. Insert the tool into the lateral slot of the lug, compress the internal spring bar and slide the strap free. Care must be taken to avoid scratching the case: it is advisable to protect the lugs with masking tape or a soft cloth during the operation. The new 21 mm strap is fitted in the reverse order.

Yes, high-quality aftermarket straps compatible with the Breitling AVI M1731410 are available, provided they are produced in the correct lug width of 21 mm. Milano Straps offers a curated selection of handcrafted straps in various leathers and technical materials, available bespoke or ready to order online, with buckles or deployant clasps proportioned to the 21 mm width.

The longevity of a leather strap for the Breitling AVI M1731410 depends on leather quality and daily use. A vegetable-tanned alligator or shell cordovan strap, with proper care — periodic conditioning and drying after water exposure — can last well beyond 3 to 5 years while retaining structural and aesthetic integrity. Lower-grade bovine leather straps deteriorate considerably sooner, often within 12 to 18 months.