Post Cereal and Jell-o shared a parent company in General Foods and their pudding and gelatin product lines saw 1962 and 1963 Baseball issues that were virtually (but not completely) identical to those issued with their cereal brands.  Roberto Clemente was, of course, included in the 1963 Jell-o set and his PSA 6 example here is exceeded by only seven higher in the PSA pop report. Colorful and bright sixty years later, this is a classic example from a well regarded set.