Strap for Navitimer B02 Chronograph 41 Cosmonaute Stainless Steel - Platinum / Japan

The lug width of the Breitling Navitimer PB02302A1B1A is 22 mm. This measurement refers to the internal distance between the two lugs at the point where the strap attaches. To verify it independently, use a digital calliper placed inside the lugs at the 6 o'clock or 12 o'clock side.

For a platinum case such as the PB02302A1B1A, the most suitable straps are matte-finished belly alligator in navy blue or tobacco brown, or natural vegetable-tanned calf leather that develops a personal patina over time. Both options complement the cold tone of platinum without overwhelming the already complex dial. For aeronautical or sporty use, a technical nylon NATO strap remains the most coherent choice with the Navitimer's heritage.

The strap on a Navitimer is changed using a spring bar tool — either a lever-end or push-pin type depending on the spring bar fitted. It is advisable to use tools with a nylon or brass tip to avoid scratching the platinum lugs. If you are not experienced with spring bar tools, it is best to entrust the operation to a watchmaker or visit the Casati Milano atelier, where fitting is included in the service.

Yes. Any strap with a 22 mm attachment width is compatible with the Navitimer PB02302A1B1A. Milano Straps offers a curated selection of handcrafted 22 mm straps in leather, alligator, calf, NATO, and rubber, all fitted with standard 1.8 mm diameter spring bars. It is important to ensure the strap has a straight end rather than a curved one, as the Navitimer's lugs are flat.

The lifespan of a leather strap depends on the material, frequency of wear, and maintenance. A quality alligator strap worn daily typically lasts 2–4 years. Vegetable-tanned calf leather, being more porous, absorbs perspiration and wears faster if untreated. To maximise longevity, it is advisable to rotate between multiple straps, avoid prolonged contact with water, and apply a leather conditioner periodically. Milano Straps straps are covered by an 18-month warranty against manufacturing defects.