Incredible photo but was it stolen from the HOF? Reverse top right has Nergo League written in red which is pretty odd and very similar to the red PD (public domain) marks the Hall used that are often written over on other stolen items in order to conceal. There's also scratched out writing (Indianapolis written over it) that you see on other stolen items where the sequential numbers used by the Hall are trying to be concealed.
Incredible photo and I hope I'm wrong but thought it was worth discussing for potential bidders.
Lot