I'd order them as follows. Mantle at top based on his universal collector popularity as opposed to accomplishments, and Williams is at bottom, just because I feel his '50's cards are probably a little less sought after than his rookie, or his other earlier cards like '41 PB. Mays/Aaron seem white hot of late, while Clemente seems to have been a mainstay for years. IMO, all listed are very popular for this era.
Mantle
Clemente
Robinson
Mays
Aaron
Koufax
Williams
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