Not in the same league historically, but along the same lines.
Bought a neat hockey postcard at a stamp show.
The back looked like it might be more interesting than usual.
A quick check here on the board, and a bit of looking up, yes, a bit more interesting.
I make custom pages for all my nicer stuff, slow going, but hopefully it will keep the stuff from being unrecognized after I'm gone.
The black and white photo and the picture of the Autograph on a stick were from other members here.
I don't have scans, but last year I picked up a small photo of one of the 1930's racing airplanes. A bit of research let me narrow down the picture to a particular day and event. One of the tougher ones, 3+ pages of explanation for a card sized photo.