The following is a list of United States mints, past and present:
From 1965 to 1967 all U.S. coins were struck without mint marks. As it was clear from
Gresham's law
In economics, Gresham's law is a monetary principle stating that "bad money drives out good". For example, if there are two forms of commodity money in circulation, which are accepted by law as having similar face value, the more valuable com ...
that the rising cost of silver (and the ensuing removal of most silver from coinage in 1965) led to hoarding or even melting of silver-based pre-1965 coins, overzealous collection of specific mint marks of those years by
numismatist
A numismatist is a specialist in numismatics ("of coins"; from Late Latin ''numismatis'', genitive of ''numisma''). Numismatists include collectors, specialist dealers, and scholars who use coins and other currency in object-based research. Altho ...
s almost certainly would have exacerbated those shortages.
Pioneer coinage, tokens, private issue coins and paper money do not have official mint marks.
See also
{{Portal, Money
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The Dalles Mint
External links
U.S. Mint facilities
Economic history of the United States
United States Mint