Here is a rare 1975 Topps 1974 World Series Game 4 #464 blankback proof issue which came from the Topps Vault (encapsulated with sticker and hologram). Found originally on a proof sheet, Topps editors likely used this to decide upon alternative design schemes (and ultimately selected the yellow/red banner instead of a black/yellow combo).
A rather
unique team collectible for your advanced, master set, or proof card collection. Likely only a handful of these out there. Regular issue card not included - just shown for comparison.