...and 1960 World Series victory (game 7 highlights below)...
...but he deserves the longer, biographical treatments of shows like SportsCentury (30 minutes in 4 parts).
Roberto played away from the national spotlight of New York and Los Angeles, but many collectors find him an appealing specialty, so demand remains high decades years after his passing. (I place his hobby value on level with Willie Mays and Sandy Koufax, just a step below Mantle and Ruth.)
This Kellogg's pseudo-3D card looks much like many others found in a 70s cereal box, but that Pirates uniform's not just any "home whites," it's a trend-setter. From the MLB's uniform history page:
1970: The Pirates became the first major league club to adopt the new double-knit fabric uniforms, which they debuted at the first game at the new Three Rivers Stadium. The jersey became a pullover with no button or zipper. The pants contained a built-in sash belt. The cap crown was mustard yellow with a black bill. Within two years, nearly every other club was wearing a double-knit uniform.
New stadiums and "big team changes" go hand-in-hand. Just ask the new-name, new-park, new-uniform Miami Marlins.
CARD BACK TRIVIA: Rudy York still holds the AL mark of 18 homers in one month, one of baseball's longest-standing power records. Sammy Sosa set the MLB standard by clubbing 20 in June, 1998.
Card blogger Night Owl wrote a personal retrospective on the Kellogg's evolution called Shrinkage and it's worth your reading time. I've only finished one of its sets (my birth year, 1972), but a 1970 Kellogg's Jim Palmer was once the Oldest Card in my Collection.
Value: Clemente's a key card in any set, so cost more than the low-grade average of a dollar or two. Pretty sure I found this on eBay for $5.
Fakes / reprints: Haven't seen any in the marketplace.