So I just bought what I'm pretty sure is a 65 Fender Bassman. The date code is OD, the front plate says Fender Electric Instruments, the backplate and tube chart say Fender Musical Instruments. One transformer is from 64, the other from 65 and stamped Fender. Sure sounds damn good and is labeled with the AA165 circuit although I haven't had a chance to go over it yet and some of the caps have been changed. I'll take some pics later, but I'm going to get back to getting her dialed in for now!