Vintage (circa 1961) CITIZEN Jet Auto Dater automatic watch. One of several models offered by Citizen that used the 'Auto Dater' system, an unusual automatic movement with a round, side-weighted rotor that turned a small gear & post, thus providing the motive force to drive the watch and store kinetic energy...and they looked pretty cool, too!
Three of the four Citizen Auto Dater watches in my vintage collection.
Although it may sound like a contradiction in terms, have a suiperb Monday!