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

The lug width of the Nivada Grenchen Chronomaster Aviator Sea Diver (ref. 86007M-BLAL) is 20 mm. This measurement corresponds to the thickness of the lugs on the 38.30 mm case and is essential for ensuring uniform and stable strap tension during use, whether in aeronautical or diving scenarios.

The ideal strap depends on intended use and aesthetic preference. For formal elegance, we recommend natural alligator in cognac brown or dark shell cordovan. For authentic avionic character, a grey-slate or navy military NATO replicates historical 1960s strap designs. For diving use, FKM (Viton) rubber ensures saltwater resistance and easy cleaning.

To change the strap, use a non-invasive spring bar tool. Carefully remove the spring bars that secure the original strap to the case lugs. Insert the new strap (always 20 mm width) by clicking the spring bars into their respective seats. Work with care to avoid scratching the stainless steel case. If unfamiliar with this procedure, consult a professional watchmaker.

Yes, absolutely. The Nivada Grenchen Chronomaster Aviator Sea Diver (86007M-BLAL) is fully compatible with quality aftermarket straps, provided they respect the 20 mm lug width. Milanostraps offers a comprehensive selection of leather, NATO, and rubber straps certified for instruments of this calibre.

A quality leather strap (alligator, cordovan, calf), with regular maintenance and prompt drying after water contact, typically lasts 3–5 years in daily wear. Vegetable-tanned straps age more rapidly but nobly, developing a rich patina. NATO and rubber straps last 5–10 years, as they are unaffected by moisture and do not deteriorate like leather.