Wrong Planchet
The wrong planchet misprint is when a coin is struck on a planchet intended for another denomination or of the wrong metal. Examples of these are cents that are struck on dime planchets, nickels on cent planchets, or quarters on dime planchets. Values depend on the type of error involved. Those struck on coins of a different denomination that were previously struck normally are of much greater value.
Brockage
A brockage misprint is a coin with a mirror image of the design impressed on the opposite side of the coin. These errors are caused when a struck coin remains on either die after being stricken and it impresses its image into the next blank planchet as it is struck, leaving a negative or mirror image. Off center and partial brockage coins are worth less than those with full impression. Coins with negative impressions on both sides are usually mutilated pieces made outside the mint by the pressing together of coins. Mirror image is when it mirrors the other side and a negative is when it is the same as the other side.
Lamination
Lamination misprints are when a fragment of metal peels off of a coins surface. This happens when a different substance such as gas oxides or dirt becomes trapped in the strip as it is rolled out to the proper thickness. Lamination flaws may still be attached to the coin's surface. Minor flaws might just reduce the coin's value. A clad coin that that is missing the full surface of one or both sides is worth more than its real value.
Broadstrike
The broadstrike coin is a misprint that was struck outside the retaining collar. When coins are struck without being retained within the collar die, they spread out larger than normal. All denominations have plain edges.
Off Center
Off center misprints are coins that have been struck out of collar and are incorrectly centered with part of the design missing. The values are for coins with 10 to 20% of the design missing from obsolete coins or 20 to 60% missing from modern coins. These are coins that did not enter the coinage press properly. The coins that are only struck off center and still contain all of the design are called broadstrikes. The coins with nearly all of the impression missing are generally worth more. Those with the date are worth the most.
Defective Die
The Defective Die misprint is a coin showing raised metal from a large die crack or small rim break. Coins that show evidence of light die cracks, polishing, or very minor die damage are generally of little or no value.
Blank or Planchet
The blank or planchet misprint is a blank disc of metal intended of coinage but not struck with dies. In the process of preparation for coinage, the blanks are first punched from a strip of metal and then milled to upset the rim. In most instances, first process pieces (Blanks without a rim) are slightly more valuable than the finished planchets.
Clipped Planchet
The Clipped Planchet misprint is a coin that is missing 10 to 25% of its metal. This results from accidents when the steel rods used to punch out blanks from the metal strip overlap a portion of the strip already punched. There are curved, straight, ragged, incomplete, and elliptical clips. Values may be greater or less. This depends on the nature and size of the clip. Coins with more than one clip usually command higher values.