@Lizardking - Thanks for the reply. I would have been genuinely impressed if someone still had this knowledge. I actually saw reference in another post to such serial numbers, which is why I posted out of curiosity.
My restoration aspirations have been a long time coming on this one, and I finally have begun the project and decided to do a vintage-modernization approach for which I will look forward to sharing when I know I can pull it off. Just for general interest, I am posting the exact state of my childhood minibike of 1974 when it was literally dug out of the earth from sitting outside for over 40 years being swallowed by Mother Nature.