Strap for Cosmonaute Stainless Steel / Blue / Croco

The lug width of the Breitling Navitimer AB0210B4.C917.731P is 22mm. This is the measurement to use when selecting any replacement strap, whether an original Breitling piece or an aftermarket handcrafted option.

The best strap depends on intended use and aesthetic preference. For a classic pairing with natural patina development, a vegetable-tanned calf leather strap in tobacco brown or cognac is the most coherent choice given the Navitimer's heritage. For formal occasions or enhanced durability, hand-stitched alligator leather offers superior texture and character. A NATO nylon strap in khaki or tricolour directly references the model's aeronautical and military origins.

The strap is removed using a springbar tool — either a thin flat-head screwdriver or a dedicated fork-tipped instrument — which compresses the springbars housed within the case lugs. Care should be taken to avoid scratching the steel surfaces; covering the lugs with soft masking tape during the operation is advisable. Any 22mm replacement strap is fitted by compressing the springbars until they click securely into the lug holes.

Yes, any strap with a 22mm attachment width is physically compatible. Milano Straps offers a curated selection of Italian handcrafted straps in 22mm, available in calf leather, alligator, NATO nylon and rubber. Standard lengths (110/75mm or 120/80mm) suit most wrist sizes; bespoke dimensions are available through the Casati Milano atelier service.

The lifespan of a leather strap depends on leather quality, maintenance and frequency of use. A handcrafted vegetable-tanned calf or alligator strap, periodically conditioned with leather cream and protected from excessive moisture, can last between three and seven years. Milano Straps handcrafted straps carry an 18-month warranty against manufacturing defects.