This vintage Omega is powered by the Caliber 351, which is a "bumper" automatic. The Caliber 351 has 17 jewels and beats at 19,800 BPH. The movement has been serviced by a professional watchmaker in the past year. The gold plated case is in good condition. The watch has a period-correct Omega crown and buckle. Dimensions:Diameter: 32mmLug to lug: 38mmLug width: 16mmThickness: 11.5mm