Glossary of Numismatics - U

U

Uncirculated

Coin that has never been used, thus retaining all or most of its original luster.

Uniface

A coin struck with the design on one side only.

Union

A proposed United States gold coin worth one hundred dollars. Only one pattern 'half union' is known to exist. Platinum $100 coins are not technically 'unions'.

Unique

Item of which only one is known to exist.

Upset

A coin struck on which the obverse and reverse are out of alignment.