Strap for Fifty Fathoms Bathyscaphe Stainless Steel / Hodinkee / Black Canvas

The Blancpain Fifty Fathoms 5100-1130-B52A is fitted with a 20mm lug width (also called strap width). This measurement is standard for the model and is determined by the geometry of the 38mm case. To verify it, measure the internal distance between the two lugs using a digital calliper: it must measure exactly 20mm. Any compatible strap must respect this specification, as an incorrect lug width could compromise the fit of the spring bars.

The ideal strap depends on usage and personal preference. For pure elegance, we recommend natural alligator or vegetable-tanned cordovan in black or cognac tones: both age gracefully and complement the watch's sober design. For tactical or aquatic use, structured rubber with superior grip keeps the case secure on the wrist. A NATO in satin cordura allows quick changes without tools. In any case, ensure the lug width is exactly 20mm and sourced from a reputable manufacture.

To change the strap, position the watch on a soft cloth with the case facing upward. Locate the spring bars (they run transversely, one on each side of the case). Using a spring bar tool, press the bar upward from below, creating enough clearance to slide out the old strap. Remove it completely and insert the new strap by aligning it to the bar holes, then release the spring bar so it reseats into the lugs. Verify that the strap is securely fixed before wearing the watch. If uncertain, rely on the Casati Milano service.

Yes, the Blancpain Fifty Fathoms 5100-1130-B52A accepts any strap with a 20mm lug width. Milanostraps.it offers a specialised collection of artisanal straps in 20mm: alligator, calf leather, shell cordovan, NATO and rubber. All our straps are designed for luxury watches and maintain quality standards identical to original Blancpain offerings. Atelier Casati Milano additionally provides bespoke service in custom colours and finishes, with work-in-progress updates via WhatsApp.

A high-quality leather strap (alligator, vegetable-tanned calf, shell cordovan) typically lasts 3–5 years with daily wear, provided it is maintained correctly. Longevity depends on usage (salt water shortens lifespan), sunlight exposure, regular cleaning and rest periods between wears. A strap worn 3–4 times per week with adequate care can reach 7–10 years. Atelier Casati Milano covers all straps with an 18-month warranty against manufacturing defects and offers reconditioning and spring bar replacement services to extend functionality.