Model # 3970WG. 18kt white gold . Leather strap with deployant clasp and second solid caseback. Manual wind movement. Opaline dial with stick hour markers. Hours, minutes, seconds, date, day, leap year, month and chronograph functions. Perpetual calendar – watch will correctly adjust for short and long months as well as 28/29 days of February once every 4 years. 100% Authentic, in great mint condition. With box and original certificate..