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Great Gibson photo, Kevin!

Not sure if this helps or not but here is the other known 1928 Crawfords photo w/Gibson (from Hake's Auction a few years ago). The pic was much larger when I uploaded it, not sure why it is showing up so small here. Hard to tell if Gibson's cap has the "P" or "H" (of course, at this size it is obviously impossible), if I had to guess, I would say "H" again.

Research shows that Gibson played on at least one Pittsburgh Industrial League Negro team during 1926 and 1927, prior to his stint with the Crawfords starting in 1928. The "H" cap could have been from his '26-'27 days, he was known to have played for the Gimbel's store team, maybe something to do with that.