I would buy a 1955 Bowman. That set is not extremely popular and $500 used to get you a decent card. It's also early in their career, which I would prefer above a 1960s card. Another that was already suggested is 1958 All Star Mantle. That is my favorite Mantle card by a country mile.
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Barry Larkin, Joey Votto, Tris Speaker, 1930-45 Cincinnati Reds, T206 Cincinnati
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