Blancpain

Ato and Blancpain Rolls watch, circa 1930

Square steel case, white Art Deco dial with applied Arabic numerals and small seconds at 6 o'clock. Hinged opening for setting the time with a wheel at 3 o'clock Mechanical self-winding movement with 17-jewel slide signed Blancpain after Hatot's patent 30 mm x 20 mm This winding system by moving the movement in the case was patented by Léon Hatot (1883-1953) in 1929 in collaboration with Blancpain