I find it interesting that the card's one sentence description touts the card as in "very good condition with top and sides all trimmed off"
This was evidently prior to anyone using the term VG as a standard self-grading term.
I suppose dealers in 1974 would not use the term "authentic" that was designated on the TPG slab later on. I have see old descriptions use the term "original"
Anyway, Andrew...not meaning to divert your initial question. I mentioned in the thread about living in the same city that that the Jumbo Wagner was found in 1974, which is the extent of my provenance knowledge
Sure sounds like you might have found the same card being sold that was later slabbed!