Girard-Perregaux “Equation Perpétuelle”

European Watch Clock and Jewellery Fair 1985 BF 311
A world first : Girard-Perregaux’s new quartz watch with perpetual date calendar. It shows the hours, minutes, seconds and date (and ... February 29 in leap years) as well as the phases of the moon. The large dial aperture displays the months, seasons, solstices, equinoxes and zodiacal signs. All functions are synchronized and controlled by the crown. Power reserve 5 years. Waterresistant case with see-through sapphire back revealing the quartz movement decorated by hand in the grand tradition of watchmaking. Sapphire crystal. Case in gold and steel or in 18K grey or yellow gold. (GIRARD-PERREGAUX “Equation Perpétuelle”)