Strap for Chronomaster Aviator Sea Diver Automatic Stainless Steel / Black / Black Leather

The lug width is precisely 20.00mm. This measurement is the international standard for mid-size sports chronographs and is compatible with all 20mm straps in the Milano Straps catalogue.

Selection depends on intended use. For vintage-sports elegance: brown alligator with vegetable tanning. For saltwater durability: black calf leather with vegetable tanning and steel deployante. For daily wear: nylon ballistic NATO. For humid environments: black FKM rubber. We recommend consultation at Atelier Casati Milano for personalisation.

Position the watch with lugs facing upward. Use a spring bar tool to gently lift the tension spring at each lug. Once released, extract the pin from the case. Repeat on the opposite side. Insert the new 20mm strap in reverse, ensuring the tension spring clicks into position securely.

Yes, provided it is specifically 20mm. Milano Straps supplies artisanal straps compatible with the 86001A-BLAL lug width. Always verify that the case suspension pins measure exactly 20.00mm to guarantee compatibility and safety.

With moderate daily use, a quality artisanal leather strap lasts 3-5 years before replacement is needed. In saltwater environments or with frequent water contact, durability reduces to 18-24 months. Vegetable-tanned leather ages elegantly, developing patina; the strap remains aesthetically pleasing well beyond structural durability.