Errors Coins
There are three types of error coins: planchet and blanking errors, striking errors, and die errors. This is known as the PDS system and was created by Alan Herbert of Krause Publications.
Planchet and blanking errors are usually due to a defect in the raw material of the minting process. The planchet can be either overweight or underweight, or the wrong metal used for the struck denomination.
Striking errors occur when coins are struck off center when the planchet is not entirely lined with the die. And double strikes occur when a coin is not expelled from the collar after the initial striking. Whenever a coin is stuck in the die, it will produce an incused design on subsequent planchets fed into the press. Double strikes can also happen when various parts of the production machinery are not fitted so a bouncing of the coin takes place giving the design a blurred appearance in whole or in part.
Die errors occur when there are damages in the die in the form of cracks, chips, and scrathes. A raised area on the coin can be left. When portions of the die breaks and the planchet is struck, metal flows into the empty area and becomes a blob of metal on the result coin. Another common error is a rotated die error. Such error is caused when the obverse and reverse side of a coin is rotated outside the normal 180 degrees alignment.
Some typical price ranges:
| Improper Planchet | $25 to $2000 |
| Split Planchet | $1 to $50 |
| Incomplete Planchet | $1 to $100 |
| Off Center Strike | $1 to $1000 |
| Double Strike | $10 to $500 |
| Capped Die Strike | $25 to $200 |
| One side strike | $10 to $500 |
| Blank Planchet | $1 to $200 |
| Cuds and Die Breaks | $5 to $250 |
| Filled Die | $1 to $25 |
| Rotated Die | $1 to $25 |
