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

The lug width of the Breitling AVI AB3521U01G1P3 is 23 mm. This is a non-standard measurement within the Breitling range, where most models feature 22 mm lugs. To verify it, use a digital calliper to measure the internal distance between the two lugs, parallel to the case.

The most suitable materials for the Breitling AVI AB3521U01G1P3 are Hornback alligator for formal wear, vegetable-tanned calf leather for daily use that develops a fine patina over time, and ballistic nylon NATO or vulcanised rubber for sport contexts. Regardless of the choice, all straps must have a 23 mm attachment width.

The strap on the Breitling AVI AB3521U01G1P3 is secured with standard spring bars. To replace it, use a fine-tipped springbar tool: insert it into the spring bar slot, compress the bar, and slide it out laterally. No specialist tools are required, though working on a soft mat is recommended to avoid scratching the case.

Yes, there are aftermarket straps compatible with the Breitling AVI AB3521U01G1P3. The sole technical requirement is a 23 mm lug width at the attachment point. Milano Straps offers a curated selection of handcrafted straps in that size, with bespoke customisation available through the Casati Milano atelier, including finish, stitching and clasp type.

The lifespan of a leather strap depends primarily on the quality of the tanning process and daily use. A high-grade alligator or vegetable-tanned calf strap, with standard care — avoiding prolonged exposure to water and perspiration, alternating with a second strap — can last between 3 and 6 years while retaining its structure and appearance. The patina that develops over time is considered an asset rather than a flaw.