Part of a 22-card set that was, according to conventional wisdom, never intended to be released by Topps, the 1968 Test basketball issue is quite rare and highly desirable today.  In 1968, Topps had no license to produce NBA cards, though the existence of this issue serves as evidence that they were at least considering it.  In the early 1990s, cards from the issue began to surface in the hobby, and just over 200 cards have been graded by PSA. 

High-grade example of Zelmo Beaty, with just eight examples graded by PSA an exceptionally rare card.  Clearly miscut, the card has been graded NM-MT 8 (MC) by PSA, though with an issue this rare, acquiring a card in any grade is the challenge.