Hello TCMA, thank you for the feedback!
I'd assumed that the negative was a copy from the start. The question is, what is it copied from, and when? It's plate glass, high level of detail, and clearly aged based on the condition of the tape. I'm guessing from the 20's.
Do you know of a source image that contains all of the same area that's in my negative? My overlay animation
(higher resolution version linked here) shows what my image contains, that's missing from my only known two original sources.
Should I resign myself to the fact that it's just a worthless copy? :-(