Omega Cal. 552 "Klinkenrad" needed Its the gear wheel that supports the rotor when whinding up. As it is broken the rotor unwinds itsself back.
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Part 550.1464 is the automatic winding gear, but the "rotor" does not unwind. So is it the winding gear or the ratchet wheel that is broken? A picture of the broken part would be helpful.
Common? Not in my experience...and I service a lot of 55X and 560X watches. It's actually pretty rare that I have to replace a ratchet wheel. Anyway, the ratchet wheel is Omega part number 72205501100. Cheers, Al