Have you maybe got an extract from Omega for this watch?
I have a 220 with a 30.598.xxx serial which was produced on december 16th, 1970. According to the observations, the 220 bezels were used from fall 1970 till latest jan 1971 so it would really be interesting to know when this one was produced with the serial 30.99x.xxx
Maybe you can PM me the full serial and I can double check with the museum, for research purposes ?
In any case, a very nice watch from a transitional period from the Premoon phase (DON) to the post-moon (DNN) with that uncommon misprint 220 bezel which is always a funny story to tell around a beer with watch friends.
Good luck with selling
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