A Transitional Error occurs
when a coin is
struck on a planchet from a previous year with different metal
composition. The most famous transitional is a 1943 copper cent.
This coin was struck on a 1942 copper blank, since 1943 cents were struck
in steel. Other famous transitionals include 1965 coinage struck in silver
instead of clad. There are also transitionals struck on blanks for the
next year. An example is 1964
coinage in clad instead of silver. Most recently, transitionals were
discovered involving the SBA and Sacagawea Dollars of 1999 and 2000. There
are a few known 1999 SBA Dollars struck on the brass planchet for the 2000
Sacagawea Dollar. A unique specimen is known of a 2000 Sacagawea Dollar
struck on a clad planchet for the 1999 SBA Dollar.
Images courtesy of Byers
1965 Dime struck on a silver
planchet, ANACS AU-55 (illustrated above).