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This is an interesting Bulova 23 Jewel 10KT white gold RGP watch. it has a 10BZ movement with a M1 date code (there is a dot after the M1) with an M3 case. Is it normal to have a post 1960 date code on a movement and then have it mismatch the case? Frankenwatch? It is 25mm x 34mm not including the crown. I appreciate your opinions.