1964 Topps Stand-Up is one of the more undervalued sets of the 1960's. The blank-backed and unnumbered cards were the first since the All-Star sets of 1951 to be die-cut. Intended to be handled, each card has a perforated image of the player on the front. Once folded, the image would "pop" from the center in order to create a "Stand Up" figure. Due the design and the fact that colored borders surround each card, finding high-grade examples is awfully tough. Mickey Mantle may be the most valuable card in the set, but it certainly is not the scarcest. That would go to the 22 single prints (SP), namely Carl Yastrzemski followed by fellow Hall of Famers Willie McCovey and Billy Williams.
This offered set is currently #24 on PSA Set Registry with a 6.20 GPA and set rating. Noteable highlights include: SP Norm Cash NM 7, Roberto Clemente EX-MT 6, SP Don Drysdale NM-MT 8 (ST), Harmon Killebrew NM 7, Mantle NM 7, Willie Mays EX-MT 6, Bill Mazeroski NM-MT 8, SP McCovey NM 7, Frank Robinson NM-MT 8 (ST), Brooks Robinson NM 7, SP Ron Santo NM 7, SP Warren Spahn NM 7 and SP Yaz NM 7.
As a bonus, there are 4 extra cards: two additional Hank Aarons (PSA EX-MT 6 and ungraded) and two additional Steve Barbers (PSA NM 7 and ungraded). The owner had previously registered the set with a PSA EX 5 Aaron, making the true GPA and set rating higher than 6.20.
https://www.psacard.com/psasetregistry/baseball/company-sets/1964-topps-stand-up/publishedset/59909