Planchet
Wrong planchet / off-metal
A blank intended for another denomination or composition entered the press, giving a coin with the wrong weight and colour.
How to spot it
Weight is well outside the reference tolerance and the colour or diameter looks wrong for the type.
Value impact
Among the highest premiums; weight verification is the primary authentication test.
Known examples
- 1943 copper Lincoln Cent
- 1944 steel Lincoln Cent
- Cent struck on a dime planchet
Check your coin for this error
The identifier looks for wrong planchet / off-metal on every scan and flags it on your result with an estimated value range.