Strap for Fifty Fathoms Automatique Titanium / Black / Bracelet

The lug width of the Blancpain Fifty Fathoms 5015-12B30-98B is 23mm. This measurement represents the distance between the two spring bar pins on the case lugs and is critical for strap compatibility. Do not confuse lug width with case diameter (45mm): the 23mm is the exact dimension your strap must have to fit properly.

The optimal strap depends on your intended use. For daily elegance, alligator leather (vegetable tanned) develops natural patina and ages beautifully. For versatility, vegetable-tanned calf offers softness and durability. For diving and salt-water environments, FKM rubber (Viton) or ballistic nylon NATO straps remain unsurpassed due to salt-water resistance and quick-drying properties. All straps must be 23mm and equipped with a deployante clasp for security.

To change the strap, obtain a spring bar remover tool (inexpensive, widely available) or visit a professional watchmaker. Position the tool under the spring bar, gently lift until the spring releases, then extract the pin. Repeat on the other side. To install the new 23mm strap, insert the spring bar into both lug holes, position it under the case, and press upward until you hear the click. Verify the strap is centred and not twisted.

Yes, any aftermarket strap with 23mm lug width is mechanically compatible. However, we recommend selecting superior quality straps (alligator, shell cordovan, vegetable-tanned calf) crafted by artisans who understand the Fifty Fathoms' aesthetic proportions. A low-quality strap can compromise the overall design of a luxury instrument. Always verify the strap features a deployante clasp for proper security and elegance.

Leather strap longevity depends on use, material, and maintenance. A vegetable-tanned alligator strap typically lasts 3–4 years with moderate daily wear, though its beauty increases with age. Premium calf has comparable durability. If you expose the Fifty Fathoms to frequent marine environments or salt water, leather will deteriorate faster—in such cases, opt for rubber or NATO. The cardinal rule is to allow the strap to dry completely after salt-water exposure and store it in well-ventilated areas. Casati Milano provides an 18-month warranty against manufacturing defects.