Blancpain · Fifty Fathoms

Strap for Fifty Fathoms Tribute to Fifty Fathoms Aqua Lung / Stainless Steel / Black / Black Canvas

Takes 23 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width23 mm
Case diameter45 mm
Reference5015C-1130-52B
FamilyFifty Fathoms
MovementBlancpain caliber 1315 hours, minutes, seconds | date
Year2007
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

The Fifty Fathoms 5015C-1130-52B, seen from the bench

The Blancpain Fifty Fathoms 5015C-1130-52B represents the contemporary evolution of a 1953 dive watch icon. Housed in 45mm stainless steel with a unidirectional bezel and sapphire crystal, it features the automatic Blancpain 1315 caliber displaying hours, minutes, seconds, and date. Water-resistant to 300 meters, this model has a 23mm lug width and embodies the functional design principles established for professional diving. The display caseback reveals the oscillating movement mechanics, maintaining the aesthetic integrity that characterizes this modern interpretation of the original diver's watch.

Frequently asked questions

What is the lug width of the Blancpain Fifty Fathoms 5015C-1130-52B?

The Blancpain Fifty Fathoms 5015C-1130-52B features a lug width of 23mm. This specific measurement requires straps designed to fit 23mm lugs; it is not interchangeable with standard 20mm or 22mm widths. Always verify the measurement before purchasing an aftermarket strap.

Which strap is recommended for the Blancpain Fifty Fathoms 5015C-1130-52B?

For a Fifty Fathoms, we recommend straps in vegetable-tanned calf leather for aesthetic versatility, alligator for formal occasions, or shell cordovan for a luxurious, aged patina. If the watch will be frequently exposed to water, vulcanised rubber or fabric NATO straps remain coherent with the model's diving heritage.

How do I change the strap on the Blancpain Fifty Fathoms 5015C-1130-52B?

To change the strap, remove the spring bars positioned at the lugs (one for each attachment point). Use a dedicated spring bar tool to compress the elastic pins and detach the old strap. Insert the new spring bars into the fresh strap and locate the lower portion in the case lugs, then release the pins to secure. A specialist atelier can perform this service with professional precision.

Can I use an aftermarket strap from another brand on my Fifty Fathoms 5015C-1130-52B?

Yes, provided the strap is expressly compatible with a 23mm lug width. Many artisan strap makers produce bespoke straps tailored for this model. We recommend verifying technical specifications and consulting an expert to ensure aesthetic compatibility appropriate to the watch's value and design heritage.

How long does a leather strap last on a diving watch like the Fifty Fathoms?

Durability depends on material and water exposure. A vegetable-tanned calf strap lasts 3–5 years with moderate use and care; more robust leathers such as cordovan may reach 5–7 years. Frequent saltwater exposure reduces these timeframes by 30–50%. Vegetable-tanned leather develops a natural patina but requires periodic conditioning. Rubber and NATO straps offer superior longevity.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only