by Vintage_hds » Thu Mar 09, 2017 12:59 pm
Our experience is '57 for sure and probably '56 was the first year for the stamped data rather than the data on a tag. Many of the component parts used in the various models carry the same part numbers. I believe when H-D implemented a change like stamping vs. tag it crossed all models. Now H-D also had a use up policy to consume inventory. So there is always a possibility that some transition years would have both styles.
The other thing I can tell you is my brother & I rebuild generators as a hobby for our and various other folks needs. But in doing so we recognize that the body casting for the 32E, 52 and other generators were the same only unique based on machining differences. For instance between the 32E and the 52 the differences are 1/4"-24 vs. 5/16-24 mounting screws, machining where the drive end oil deflector interfaces with the body casting, and of course the stamped tag on the later bodies. I will add my normal disclaimer which is "I've told you more than I know"