DIAM. 37 mm. THICKNESS 11 mm. An attractive an well preserved example of the larger-size Omega chronograph from the second half of the 1940s. With steel case pleasingly mellow original unrestored dial and caliber 320 movement. The caliber 320 was developed from the caliber 27 CHRO with certain modifications and renamed caliber 320 in 1946. See: "Omega - A Journey Through Time" Marco Richon p. 539.