To save money and time, rather than altering a date on a die, the date was often changed instead of a bran new die being created. On some coins it is possible to see traces of the old date on the coin.
a date on a coin over a different date. May be one or more different numbers
One date struck over another on a coin, by repunching one date over the original date on the die. Usually to economise on die use at the end of a calendar year, but also to correct errors.
A coin struck from a die with at least one digit of the date repunched over a different digit, e.g. 1809/6 or 1942/1.
A coin struck from a die with one or more digits of the date repunched over a different digit, e.g. the 1942/1 Mercury dime.
A coin struck from a die with a date that has one year punched over a different year.
A date made by superimposing one more numbers on a previously dated die. Take a look at the Jersey 1841 farthing.
A die error exhibiting two different dates.
The date made by superimposing one or more different numbers on a previously dated die.
One or more digits in a date altered by superimposing another figure. Alterations of this kind, by means of small hand punches, were made to dated dies so that they could be used in years other than that of the original manufacture. Coins with overdates invariably show traces of the original digit.