White 1800 gold 1850 new upgraded version of Vacheron constantin classic beauty appreciation Vacheron Constantin heritage retrograde calendar watch model 4010U/000R-B329. The panel design is unique, the function is simple and practical. It uses the self-made Cal.2460 R31L/1 movement with a diameter of 42.5 mm. Paired with an original Italian cowhide buckle, it is more comfortable to wear, simple and refined yet elegant, and a classic heritage Timeless,,vacheron,cowhide