1968 Topps 3-D Baseball Roberto Clemente card. Graded NM-MT 8 by PSA. This is an exceptional high-grade example of what is considered one of the most desirable of all 1960s Topps cards, not to mention Clemente's rarest card. Produced a full two years prior to the more well-known Kellogg's 3-D set, the 1968 Topps thirteen-card "3-D" set was a test issue and featured only two future Hall of Famers: Clemente and Tony Perez. While there has always been some debate whether or not a small number of 1968 Topps 3-D cards were actually issued for retail sale, what is not in question is their scarcity. Very few 1968 Topps 3-D cards have surfaced and most examples in the hobby originate from Topps employees. This is one of only seventy-four 1968 Topps 3-D Clemente cards listed in the PSA Population Report and technically it is a superb example. Centering is near perfect with clean rounded corners and smooth edges. The reverse is clean and bright white.