Strap for Villeret Équation du Temps Marchante Red Gold

The lug width of the Blancpain Villeret 6638-3631-55B is precisely 23mm. This measurement is specific to this model and represents the standard for lug attachments on the Villeret collection. To verify it yourself, measure the distance between the inner edges of the lugs with a digital calliper, positioning it perpendicular to the case.

The ideal strap depends on your intended usage and aesthetic preference. Alligator leather in cognac or dark brown remains the most refined and versatile choice, capable of expressing the timeless elegance of the rose gold case. Shell cordovan offers a unique tactile density and develops a personal patina, whilst vegetable-tanned calf leather allows for a naturally maturing appearance over time. Milano Straps' 23mm straps are calibrated and tested for perfect mechanical compatibility.

The Villeret 6638-3631-55B strap is changed using a spring bar removal tool. Locate the small holes at the ends of each lug, insert the tool into the lower hole and gently push upward to release the spring mechanism. The process requires care to avoid scratching the rose gold case. Alternatively, Casati Milano offers a strap replacement service at the Milan atelier by appointment.

Yes, all straps with a 23mm lug width are compatible with the Villeret 6638-3631-55B. Milano Straps offers a complete collection of 23mm straps in various materials—alligator, calf, shell cordovan, NATO, and rubber—all precisely calibrated for Blancpain standard lug attachments. Always verify the lug width before ordering, as 22mm or 24mm sizes will not ensure proper fit and security.

Longevity depends on material quality and usage frequency. A high-quality alligator or shell cordovan strap, with proper care, can last 5–8 years of daily wear. Vegetable-tanned calf leather typically has a shorter lifespan, approximately 3–5 years, as it is softer and subject to faster wear. Milano Straps provides an 18-month warranty against manufacturing defects and offers maintenance and replacement services.