some infos: it is powered by the Caliber 12 micro rotor. developed by Buren,Heuer and others. and used in many 70`s Heuer chronos. as in Hamiltons and Bulova`s. this one is a monster; 44 mm by 49 mm from pusher to crown. massive steelcase with a very unusual blueish/grey bezel....... kind regards., achim