it has to be a jumble of parts in some fashion. as mentioned a 32m movement corresponds to a 145.022-69, which would have a painted omega logo.
as your dial has an AML (applied metal logo) it is one of two things: 1. a fairly rare AML from a 145.022-68, which was a one off year transitional old style dial from the 321 speedies placed on the first year of 861. or 2. a 321 dial with repositioned and reshaped feet.
the chronograph second hand is from earlier 321 model watches, as is the mentioned pre-moon caseback.
the DON bezel, isn't usually seen on later year production 145.022-69 (32m serial numbers).
what's the history of the watch? is it a family heirloom? it's not a collector's dream, but there's no reason you can't just wear it and enjoy it as it is. have it serviced and let it keep time as intended.