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| COIN COLLECTING DEFINITIONS STARTING WITH "U" |
Ultra High Relief: an extremely rare variety of the 1907 $20 St. Gaudens gold piece that has extremely high relief and wire rims.
ultra rarity: a coin of which there is only a few known.
under-bidder: the person with the second-highest bid in an auction. Also known as the Loser.
under-grading: the grading of a coin below its true grade. This practice is sometimes used to purchase coins below what they are really worth.
unique: one-of-a-kind.
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