Strap for Fifty Fathoms Bathyscaphe Stainless Steel / Grey / Grey Nato

The lug width of the Blancpain Fifty Fathoms 5000-1110-NABA is 23mm. This measurement refers to the distance between the two spring bars that protrude from the case lug. Verifying this compatibility before purchasing an aftermarket strap is essential, as an incorrect width would prevent the bars from seating properly.

For a diving instrument of this calibre, we recommend alligator for formal and elegant contexts, shell cordovan for exceptional durability and a developing patina, or vulcanised rubber for frequent diving and aquatic environments. Vegetable-tanned calf leather offers an ideal compromise between robustness and aesthetic versatility, ideal for those transitioning between professional and recreational settings.

Changing the strap requires a spring bar remover tool. Position the remover under the bar on the opposite side to the lug, apply gentle inward pressure to release the pin, carefully withdraw it and repeat on the second side. Always visually inspect the pins for integrity before installing them in the new strap. If you are unfamiliar with the procedure, consult a qualified watchmaker.

Yes, the 5000-1110-NABA model accepts any strap with a 23mm lug width, provided the spring bars are installed correctly. We recommend high-quality artisanal straps (alligator, shell cordovan, vegetable-tanned calf) that preserve the aesthetic and functional value of the watch, rather than standard polyurethane options.

Longevity depends on the leather type and usage intensity. Alligator resists 8–12 years of daily wear; vegetable-tanned calf 10–15 years; shell cordovan up to 20 years. Vulcanised rubber lasts 5–7 years. These timeframes extend significantly if the strap is rotated regularly between two or more options, allowing the material to breathe and recover elasticity.