[1963Topps Set]

I picked this up from Ebay a few months ago. There was no mention of the Agganis autograph in the header or listing. I was the only bidder at $10.00! When I saw the sheet music relisted, I got upset and contacted the seller. He told me he took it upon himself to send a mint copy and not the one "with all of the writing on it"! I told him I wanted the one with the writing. He then sent that one to me.

Is this real? What kind of value would it have if it were? The sheet music came out in 1954, so there is a window of opportunity. I just don't understand how a baseball player signed a music item. The sheet music is for the McGuire Sisters "Sincerely"