Blancpain · Fifty Fathoms

Strap for Fifty Fathoms Chronographe Flyback Quantieme Complet Stainless Steel / Blue / Blue 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
Reference5066F-1140-52B
FamilyFifty Fathoms
MovementBlancpain caliber 66BF8 hours, minutes, small seconds | date, day, month | Chronograph, column wheel, Flyback | moonphase
Year2010
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 5066F-1140-52B, seen from the bench

The Fifty Fathoms represents Blancpain's line of dive watches, originally introduced in 1953. It is equipped with the automatic caliber 66BF8 with functions of hours, minutes, small seconds, complete date, flyback column-wheel chronograph, and moon phases. The watch features 23mm lugs and a screw-down crown to ensure water resistance.

Frequently asked questions

What is the lug width of the Blancpain Fifty Fathoms 5066F-1140-52B?

The lug width of the Blancpain Fifty Fathoms 5066F-1140-52B is 23mm. This measurement is critical for aftermarket strap compatibility. To measure accurately, insert a ruler between the lug pins at the widest point of the lug: the result must be exactly 23mm.

Which strap is best for the Blancpain Fifty Fathoms 5066F-1140-52B?

There is no single optimal choice. Vegetable-tanned alligator offers artisanal elegance and developable patina over time. Shell cordovan guarantees deep lustre and character. Gummed calf ensures durability for frequent diving use. NATO webbing in Cordura represents pure functional efficiency. Selection depends on primary usage context and personal aesthetic preferences.

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

The strap on the Fifty Fathoms 5066F-1140-52B is changed via removable spring bars that secure the lugs to the watch case. Use a dedicated spring bar tool to laterally press the pin and extract it, then remove the worn strap and insert the new one, aligning the pins into the appropriate holes. A straightforward operation requiring care to avoid case scratching.

Can I use an aftermarket strap on a Blancpain Fifty Fathoms 5066F-1140-52B?

Yes, provided the lug width is 23mm. Numerous artisans produce compatible straps in fine leather (alligator, shell cordovan, calf) or technical materials (NATO, FKM rubber). It is advisable to consult specialised watchmaking strap manufacturers who guarantee construction quality and precise metric compatibility.

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

Durability depends on material and usage intensity. Vegetable-tanned alligator, if properly maintained and not subjected to frequent immersion, lasts 3-5 years. Shell cordovan resists 5-7 years due to fibre density. Gummed calf has durability comparable to alligator. Technical rubber lasts 2-3 years. Regular cleaning and air-drying after water contact significantly extend useful life.

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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