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Blancpain · Fifty Fathoms

Strap for Fifty Fathoms Bathygraphe Quantième Complet Black / 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
Reference5054-1110-NABA
FamilyFifty Fathoms
MovementBlancpain caliber 6654 hours, minutes, seconds | date, day, month | moonphase
Year2018
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 5054-1110-NABA, seen from the bench

The Blancpain Fifty Fathoms 5054-1110-NABA is the contemporary evolution of a 1953 diving watch designed for the French Navy. The 43 mm stainless steel case features a unidirectional 60-minute bezel, domed sapphire crystal, and 300 metres water resistance. The 23 mm lug width accommodates robust straps. The Blancpain caliber 6654 is an automatic movement with hours, minutes, seconds, date, day of month, and moon phase. This watch exemplifies technical robustness and legibility in extreme conditions.

Frequently asked questions

What is the lug width of the Blancpain Fifty Fathoms 5054-1110-NABA?

The lug width of the Blancpain Fifty Fathoms 5054-1110-NABA is 23 mm. This dimension is measured internally between the attachment pins of the case and determines compatibility with available straps. It is a specific measurement for this model that reflects the proportion between the 43 mm case diameter and the strap attachment points.

Which strap is most recommended for the Blancpain Fifty Fathoms 5054-1110-NABA?

The ideal strap depends on usage and aesthetic preferences. Vegetable-tanned alligator offers noble grain and develops deep patina over time, ideal for those who value longevity and classical aesthetics. Shell cordovan concentrates natural oils and develops extraordinary chromatic richness with age. Calf leather is the discreet and refined choice for formal contexts. For technical spirit, NATO or vulcanised rubber echo the Fifty Fathoms' diving heritage without functional compromise.

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

Strap replacement is performed via spring bars (bayonet-type springs) that connect the strap to the case. A dedicated tool is required to push the springs laterally and release the strap from the pins. The operation should be performed with the watch positioned stably, with care not to scratch the case. Those unfamiliar with the process are advised to consult a specialised workshop or Casati Milano.

Can I use an aftermarket compatible strap on my Fifty Fathoms 5054-1110-NABA?

Yes, you may use aftermarket straps provided the lug width is exactly 23 mm. We recommend selecting artisanal straps crafted in superior leather (alligator, calf, shell cordovan) so as not to betray the nobility of the case. Milano Straps are handcrafted at Casati Milano and guarantee certified compatibility with standard spring bars.

How long does a leather strap last on a watch like the Fifty Fathoms 5054-1110-NABA?

Durability depends on the leather type and usage pattern. Vegetable-tanned alligator lasts approximately 8–12 years of daily wear, developing patina rather than deteriorating. Shell cordovan can reach 15 years or beyond, concentrating character over time. Standard calf leather lasts 5–7 years. Milano Straps guarantee 18 months against manufacturing defects, but with proper care (drying, protection from moisture) real-world lifespan is significantly longer.

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