Strap for Navitimer 8 B35 Automatic Unitime 43 Stainless Steel / Silver / Blue Croco

The Breitling AVI A3521U01G1P2 features a 23mm lug width. This is a non-standard measurement deliberately chosen by Breitling for its professional chronograph line. It is essential to use straps manufactured specifically for this width; adapting 22mm or 24mm straps will compromise both the aesthetics and the secure fit of the strap.

The most suitable straps for the Breitling AVI A3521U01G1P2 are alligator leather (croisé or classic grain) in shades of brown, havana, or black, as well as shell cordovan for those who appreciate a naturally developing patina. Functional alternatives include ballistic nylon NATO straps and vulcanised rubber straps. All options must be produced in the correct 23mm lug width.

To replace the strap on the Breitling AVI A3521U01G1P2, a springbar tool (fork-type or screwdriver) is required to remove the spring bars securing the strap to the lugs. Work on a soft surface to protect the case. If in doubt, it is advisable to consult a qualified watchmaker or the Casati Milano atelier.

Yes. Milano Straps produces high-quality aftermarket straps specifically in the 23mm size compatible with the Breitling AVI A3521U01G1P2. Straps are handcrafted in Italy using selected vegetable-tanned leathers. The Casati Milano atelier also offers a fully bespoke service with direct material selection and complete personalisation.

The lifespan of a leather strap depends on leather quality, tanning method, and daily usage. A handcrafted alligator or shell cordovan strap with vegetable tanning, when properly maintained (leather conditioner, rotation with other straps, avoiding prolonged moisture exposure), can last between 3 and 7 years while retaining its aesthetic integrity. Milano Straps offers an 18-month guarantee against manufacturing defects.