I believe that it is a polish that the mint applies after striking to a non-proof coin. I have a couple of 2006-W Unc Silver Eagles that are listed as burnished. It doesn't have the mirror surface of a proof, but is a more striking appearance than a standard unc coin.
Quote: click on the Glossary to your left. your word is there.
Darn I wish that was 5 times bigger at the left there or on top. I don't know how many times I've told people to go here or there for such explanations. I keep forgetting about that Glossary thing at the left. Maybe I'll highlight it on my monitor.
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