Pretty much any card you've ever seen on the front of one of those baseball card encyclopedias: Cobb T206s, Ruth / Gehrig Goudeys, Joe Jackson Crack Jack, Mathewson T205. DiMaggio Playball, etc.
I consider any card there's always a buyer for as a "blue chip". The have to have it cards will always be different for different people, but someone will always be there to buy your 51 Bowman Mantle, for example.
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