Strap for Cosmonaute Limited Edition

The lug width of the Breitling Navitimer AB021012/BB59/435X/A20BA.1 is 22 mm. This measurement is standard for the 43 mm Navitimer 01 case and defines the strap width required at the end that fits between the lugs.

For the 43 mm Navitimer, a vegetable-tanned alligator strap with a matte finish is the most coherent choice given the instrument-style dial. Deerskin calf and woven nylon NATO straps are excellent alternatives for everyday or sport use. It is essential that the strap end is shaped or sufficiently flexible to follow the curved lugs characteristic of this model.

To replace the strap on a Navitimer, you will need a fine-tipped springbar tool. The lugs are slightly curved, so care should be taken to avoid scratching the stainless steel case. Compress the springbar tips inward, remove the old strap, and fit the new one ensuring the ends are correctly aligned with the 22 mm lugs.

Yes, there is a wide range of aftermarket straps compatible with a 22 mm lug width. Milanostraps.it offers a selection of handcrafted straps — in alligator, calf, shell cordovan and rubber — specifically suited to the Navitimer, with curved or straight ends depending on preference. Choosing a high-quality strap is important to match the technical and historical significance of the watch.

The lifespan of a leather strap depends on material quality, daily use and care. A high-quality vegetable-tanned alligator strap, kept away from excess moisture and perspiration, typically lasts between 2 and 5 years with regular wear. The 18-month manufacturing defect warranty offered by Casati Milano covers any structural failures not attributable to normal wear.