The Holy Grail from the Set that Never Was. This proof from a 1968 Topps 3-D set that was never manufactured remains one of the collection's prized finds, and we have one here. Roberto (Bob) Clemente is captured in this SGC encapsulated authentic lot. Despite not being officially released, a handful of these blank-backed proofs have come to market, with Clemente easily being the prize among them. While there is some creasing, it is difficult to find this beauty in any condition, a rare opportunity.