Blancpain · Villeret

Strap for Villeret Quantieme Complet 8 Jours Red Gold / Black Enamel

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

Lug width23 mm
Case diameter42 mm
Reference6639-3637-55B
FamilyVilleret
MovementBlancpain caliber 6639 hours, minutes, small seconds | date, day, month | moonphase
Year2010
CaseRed Gold

Spring bar

Swiss Standard universal spring bars

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

The Villeret 6639-3637-55B, seen from the bench

The Villeret reference 6639-3637-55B is equipped with the Blancpain 6639 caliber featuring hour, minute, small seconds, complete calendar, and moon phase indications. The watch has 23mm lugs and belongs to the Swiss manufacturer's classic collection. The movement offers calendar complications with day, date, month, and moon phase displays.

Frequently asked questions

What is the lug width of the Blancpain Villeret 6639-3637-55B?

The lug width of the Blancpain Villeret 6639-3637-55B is 23mm. This measurement represents the internal distance between the case lugs and determines compatibility with aftermarket straps. To verify precisely, measure from the inside of one lug to the inside of the opposite lug using a digital calliper.

What strap is most suitable for the Blancpain Villeret 6639-3637-55B in rose gold?

For the Villeret in 18-carat rose gold, we recommend an alligator leather strap in natural or dyed finishes: dark brown, burgundy, or black. Alligator offers fine, proportionate texture that enhances the warm tone of the gold. Alternatively, vegetable-tanned calf develops a compelling patina, whilst shell cordovan represents the most luxurious choice thanks to its natural density and luminosity.

How do I change the strap on my Blancpain Villeret 6639-3637-55B?

Use a spring bar tool to remove the elastic pins that secure the strap to the lugs. Insert the flat lever into the small lateral hole of the lug, gently lift the spring bar, then extract the strap. Repeat on the opposite side. To install the new strap, align the holes with the elastic pins and press until you hear a click. If you are inexperienced, consult a professional watchmaker.

Can I use an aftermarket 23mm strap on my Blancpain Villeret 6639-3637-55B?

Yes, any strap with 23mm lug width is fully compatible with the Villeret 6639-3637-55B. High-quality aftermarket straps guarantee total compatibility and often offer greater aesthetic choice than original Blancpain straps. Ensure that leather quality is excellent to do justice to the value and dignity of the watch.

How long does a leather strap last on a Blancpain Villeret 6639-3637-55B?

A high-quality leather strap (alligator, calf, shell cordovan) typically lasts 3-5 years with regular use, provided proper maintenance: avoid prolonged moisture exposure, apply leather conditioner every 6-12 months, and store the strap away from direct heat sources. A vegetable-tanned shell cordovan strap tends to last longer thanks to the material's density. Casati Milano guarantees 18 months against manufacturing defects.

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