After school, I never thought of collecting autographs. From those days I have Basie and a bunch of guys from the band circa '62 and the Gillespie quintet in transition - Diz, Moody, Lalo, Chris White & Rudy Collins.
I do have a copy of John Patton's "Understanding" signed "to Stan, John Patton, organ" but obviously I bought the lp used.
I do have some contracts and checks signed by famous musicians.
This reminds me of a story Roscoe Mitchell told me about 25 years ago (if I told this before, forgive me). Roscoe was teaching a bunch of young/aspiring musicians and Sonny Rollins came to spend some time with his students. At the end of the session everybody lined up to get Sonny's autograph. Sonny signed them all and Roscoe thinks "this is one of my idols, I should get one too". When Rock presented his piece of paper Rollins says "You're one of the cats, I can't do that". Roscoe told me this with equal amounts of pride and regret.