Blancpain Villeret Équation du Temps Marchante

The Blancpain Villeret Équation du Temps Marchante, reference 6638 3631 55B, has a 42 mm case in red gold. The case measures 11.5 mm thick, with a lug width of 23 mm. A sapphire crystal covers the white grand feu enamel dial. The self-winding calibre 3863 drives the watch, with a 72-hour power reserve. This is a perpetual calendar with a running equation of time, a complication that shows the difference between solar and mean time throughout the year, alongside a moon phase display and small seconds. The case is fitted to an alligator leather strap with a folding clasp. Water resistance is modest, rated to 30 metres.