Definitions for "Key date"
Keywords:  scarce, mintage, rarest, lincoln, dime
A difficult to find date of an otherwise fairly easy series. Examples are the 1946 and 1949 Threepences and most of the 1905 silver coins. Click here to see the British key date coins from 1821 - 1970.
a coin whose date and mint mark are extremely scarce and therefore much sought-after by collectors
Low mintage / rare coins in a coin series normally the most expensive ie: 1909 S VBD Lincoln cent. L mint mark - only found on the 1864 Indian cent. Stands for Longacre the designer.