OMEGA MADE SOME OF THE BEST EARLY BUMPER AUTOMATIC MOVEMENTS IN LARGE PRODUCTION.  THE BEST AUTOMATIC, IN MY OPTION,  WAS THE SEAMASTER CHRONOMETER, IN A 18K SOLID GOLD CASE, WITH A SCREW IN BACK. OMEGA MADE A VERY SMALL QUANTITY OF THE CALIBER 352 CHRONOMETER MARKED ON THE MOVEMENT.  ALTHOUGH  THIS WATCH DID NOT SELL WELL AT THE TIME (1948-1952),  THE 325 WAS A COSTLY MOVEMENT TO PRODUCE, AT THE SAME TIME, OMEGA CAME OUT WITH THE CONSTELLATION. SAME MOVEMENT BUT A DIFFERENT DIAL AND CASE. LATER, AFTER MUCH SUCCESS SELLING THE CONSTELLATION, OMEGA CAME OUT WITH A LESS COSTLY MOVEMENT, THE CALIBER 354, WHICH OMEGA USED IN THE CONSTELLATION UP UNTIL 1958. THIS MOVEMENT WAS ALSO TESTED AS A CHRONOMETER, AND WAS CONSIDERED AS ONE OF THE BEST BUMPER AUTOMATIC MOVEMENTS IN ITS TIMES.  I HAVE A FEW OMEGA SEAMASTERS WITH THE 352 MOVEMENT, AND I HAVE FOUND THEM TO RUN AS WELL OR IF NOT BETTER THAN,  ROLEX 1990 EXPLORER, MY 18K DAY-DATE, AND MY DATEJUST.