Strap for Fifty Fathoms Automatique Red Gold / Blue / Calf

The lug width of the Blancpain Fifty Fathoms 5015-3603C-63B is 23mm, a non-standard dimension that requires careful consideration when replacing the strap. To verify this measurement, use a digital calliper, measuring between the two lugs on either side of the case.

Alligator leather in vegetable tanning represents the most sophisticated choice, with pronounced grain that complements the rose gold case beautifully. Excellent alternatives include shell cordovan in cognac tones, or structured calf leather in deep brown for a formal, contemporary aesthetic.

The strap is replaced using a spring bar tool (a specialized removal implement) to release the internal springs in the lugs. Insert the tool's tip into the lateral slot of the lug, apply gentle pressure to compress the spring, and extract the spring bar. Repeat for both sides and install the new strap by reversing these steps.

Yes, high-quality artisanal strap makers produce compatible 23mm straps. Always ensure the lugs are rose gold-tone or coated, as unfinished steel or other metals may scratch the case. Casati Milano manufactures bespoke straps with an 18-month manufacturing guarantee.

A high-quality alligator or shell cordovan strap lasts approximately 5–7 years with regular use and proper care (occasional cleaning, drying after moisture exposure). Lifespan depends on sun exposure, water contact, and frequency of wear. Structured calf leather straps typically last slightly less, around 4–6 years.