When one date in a series is worth much more than another, a counterfeiter may try to use a tool to try to change the date of a common issue into a rarer date. Altered dates can be deceptive since the original coin was genuine with the correct details, weight and composition—only the date is illegitimate.
Even the most skilled coin doctor will always leave behind “tool marks,” which are lines left by the tool used to sculpt the new date. Not surprisingly, these tool marks are usually concentrated around the digit that has been altered. Like counterfeits, coins with altered dates or mintmarks will not be certified by NGC. Coins with other types of tooling are eligible for NGC Details grading, which assigns an adjectival grade along with a description of the problem. Source
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