Mount Removed?

Forgive a newbie question, but what does PCGS mean by "Mount Removed"? This gold half-eagle has been in the family for probably 70 years or more and has never been in what I think of as a mount. Also, exactly what does PCGS consider "damage" to a coin so that it is not gradable? I wish PSGS would provide just a little more information as to why they refused to grade my coins. When I have stamps expertised they tell me what the flaws are.
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"Paper money eventually returns to its intrinsic value---zero."----Voltaire
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<< <i>Means a gold loop was attached to the coin (usually the edge at 12:00) so it could be used as jewelry. Also, welcome.
It can also mean the coin was in a bezel, or mounted in a piece of jewelry using prongs.
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