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Blancpain · Fifty Fathoms

Strap for Fifty Fathoms Bathyscaphe Flyback Chronograph Stainless Steel / Grey / Black Nato

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

Lug width

23mm
23 mm strapsAll Blancpain
Lug width23 mm
Case diameter43 mm
Reference5200-1110-NABA
FamilyFifty Fathoms
MovementBlancpain caliber F385 hours, minutes, small seconds | date | Chronograph, column wheel, Flyback
Year2015
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

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

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The Fifty Fathoms 5200-1110-NABA, seen from the bench

The Blancpain Fifty Fathoms 5200-1110-NABA continues the legacy of the first modern dive watch created in 1953. The 43mm stainless steel case features a unidirectional bezel, screw-down crown, and radial dial contrast designed for readiness in harsh underwater environments. It is equipped with the proprietary Blancpain F385 movement, a column-wheel chronograph with flyback function, date window, and extended power reserve visible through the sapphire caseback. Water-resistant to 300 meters (30 atm) per ISO 6425 standards, with 23mm lug width.

Frequently asked questions

What is the lug width of the Blancpain Fifty Fathoms 5200-1110-NABA?

The lug width of the Blancpain Fifty Fathoms 5200-1110-NABA is 23mm. This measurement represents the space between the two lugs, measured perpendicular to the watch case at the spring bar insertion points. A compatible strap must feature a 23mm lug width to ensure proper fit and security when changing the watch band.

Which strap is recommended for the Fifty Fathoms 5200-1110-NABA?

For the Fifty Fathoms 5200-1110-NABA, straps in vegetable-tanned alligator (natural patina development), shell cordovan (inherent durability and sophisticated texture), or vegetable-tanned calf (formal elegance combined with practicality) are ideal choices. For intensive aquatic use, vulcanised rubber or textile NATO options are recommended. The optimal choice depends on your intended usage: daily elegance, nautical sport, or technical diving.

How do I change the strap on my Blancpain Fifty Fathoms?

Changing the Fifty Fathoms 5200-1110-NABA strap requires a spring bar removal tool. Press the tool under the spring bar from both sides until it disengages from the lug holes. Remove the old strap and align the new strap holes with the lugs. Snap the spring bar back into position until you hear the security click. If unsure, entrust the operation to a professional service provider.

Is there an aftermarket strap compatible with the 5200-1110-NABA?

Yes, any 23mm-width strap is compatible with the Blancpain Fifty Fathoms 5200-1110-NABA. Milanostraps offers a collection of bespoke Italian-crafted 23mm straps made from carefully selected leathers including alligator and cordovan. You may order the strap online or select the material directly at the Casati Milano atelier by appointment.

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

A leather strap's lifespan depends on usage patterns and material selection. A vegetable-tanned alligator strap, when properly maintained, lasts 5-8 years. Shell cordovan, owing to its natural hardness, typically reaches 8-10 years of service life. Vegetable-tanned calf has an average lifespan of 4-6 years. Vulcanised rubber is practically unlimited. Milanostraps guarantees its straps for 18 months against manufacturing defects, regardless of material chosen.

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