Thanks for the reply. I think Les Richter is at least plausible, though the letter at the start of the first name does not look much like an "L".
As far as the 1963 date, it occurred to me (after my initial posting) that to be able to attend a August 1963 dinner, a player on the active roster would be at training camp, not at a dinner in South Carolina. So the "1963" could just be the signer writing down the date of the signature.
I did go back and look at older rosters, and did not see other possible matches.
Also, more importantly, after he retired Richter had a NASCAR affiliation, serving as the General Manager of the Riverside International Raceway starting in 1962. So it actually makes sense that he would have attended this Darlington Record Club event.
I believe you have solved the mystery! Thanks so much for your help.