There is a very limited supply of SGC graded 1960 Leaf #58 Hal Smith (Big Head variation) cards. Just this one... in a strong SGC 7! As a way to sidestep the gum market, Leaf distributed these cards in bags of novelties (marbles). One could dig deep into researching the two Hal Smith's that played at the time, that are in the 1960 Leaf set, plus the variations in the Hal Smith cards, but you wouldn't be losing your marbles by adding this rarity to your card collection.