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The Blue Cap Cheese Company released these sets in the 1950s and they are similar to slides, most likely made to be projected with light onto a surface to enlarge. There were 12 subsets released, each with 12 cards. The Sports series included one Basketball card, # 7, seen here.
Measurements: 1.375" x 1.5"
BLUE CAP CHEESE FLIXIES SPORT SERIES #7 BASKET BALL (U.K.)
1959
