This is an Omega Megasonic, the highest evolution of tuning fork technology. This Omega 1220 movement was only used in the Omega Megasonic and was a try of Max Hetzel, to bypass his own patent, owned by Bulova. He did too good a job in formulating the original patent, so he was not able to get around it and production had to be stopped. The transmission of the tuning fork swing to the index wheel is done by magnetic coupling. Movement Nr: 34929186 , Caliber 1220, Referenz Nr.: 1980065, 20 micron gold plated, Signed inside of the back: ”€Carriere Lunette, Plaque Oro 20 microns, Fond Acier Inoxydable, Omega Watch Co, Fab. Suisse, Swiss Made“. The frequency of the tuning fork is 720 Hz.
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