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On a coin that means the coin was struck twice for the collector value. Notice the coin should have a mirror like finish. And the 63 means the shape it's in from 60 to 70 for proof coins usually. Regular coins start at one. That would be a pretty good shape for an old coin but a little poor for a new coin.
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Earn +20 ptsQ: What does ch Proof-63 mean?
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