The cards don't exist unsigned. The were made to be signed. However, single signed cards have had the second signature forged. So there are a good number of examples with a good Griffey and a fake Mantle. I'd get a good opinion on the sigs and be careful.
This does however mean that any single signed card is authentic, griffey or mantle.
Last edited by drc; 02-20-2012 at 09:35 PM.
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