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

The lug width of the Breitling AVI AB3521U01G1P4 is 23mm. This is a non-standard measurement compared to the more common 20, 22 and 24mm sizes, which means straps must be sourced from manufacturers that specifically produce this width.

The most suitable materials for the Breitling AVI AB3521U01G1P4 are smooth alligator in tobacco or dark brown tones, vegetable-tanned calf leather for those who appreciate a developing patina, and shell cordovan for maximum longevity. A heavy nylon NATO strap is ideal for sporting or travel use, consistent with the tool watch aesthetic of this reference.

The strap on the Breitling AVI AB3521U01G1P4 is replaced by using a springbar tool to release the spring bars securing the strap to the lugs. It is advisable to work on a soft cushion to protect the case and caseback. Since the lug width is 23mm, it is essential to ensure the replacement strap is made precisely to this measurement.

Yes. Milanostraps.it stocks aftermarket straps made specifically for the 23mm lug width, compatible with the Breitling AVI AB3521U01G1P4. Casati Milano also offers a fully bespoke made-to-measure service by appointment, crafting straps in fine Italian artisanal leather.

Lifespan depends on material and usage. A vegetable-tanned calf leather strap typically lasts 12 to 24 months with daily wear. Quality alligator and shell cordovan can last considerably longer — upwards of three years — owing to the density of their fibres and resistance to deformation. Regular conditioning and rotating between multiple straps will extend their service life significantly.