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Dear Babe: I got this card - Willie Mays 1951 Bowman (No. 305) - from a pack of bubble gum when I was 12-years-old. For some reason, I kept this card.
Don Jean, Nashua, N.H.
There's no doubt it came out of a pack with gum, since it has two stains on the back. It also looks like the front edges and corners show some wear. Beckett's Almanac of Baseball Cards and The Standard Catalog of Baseball Cards from the editors of Sports Collectors Digest list Mays' rookie card at $1,900-$3,000 in near mint condition and $950-$1,500 in excellent shape. The Standard Catalog also has a value of $550 for a card in very good condition. Based on my description of the photocopy you enclosed, Leighton Sheldon of Lelands.com in New York put the value at $750-$1,000.
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-Bob