Collecting error coins struck on defective planchets allows you to collect unique examples as every one is different. There are various types of defective planchet errors as shown below in the photos. These errors happen when planchets are defective before the strike and not after a coin is struck. An example of the difference is when a lamination happens pre strike on a planchet, therefore the coin is struck on a defective planchet. If the lamination happens after the strike, then it is called a lamination error. Defective planchet errors are different than error coins struck on scrap and fragments which are not planchets. Many error coin collectors like to add unique examples of error types to their collection. Defective planchets error coins let collectors add uniqueness to their collection as every one is different.

The is the largest defective planchet error that I have ever seen on a Shield Cent. Major errors are very rare in the Shield Cent series making this example uniquely collectable.

It is rare to find a Franklin Half Dollar struck on a planchet with such a large defect. This error coin has a nice grade and great eye appeal making it very collectable.

This is a cool struck on a defective planchet error on a Kennedy Half Dollar. Only the lucky number 7 is visible on the date adding to the coolness of this error coin.

Here is a nice example of a struck on defective and cracked planchet error on a 2004-D Wisconsin Statehood Quarter. Major errors on Statehood Quarters since 2002 are very rare. This would be a nice addition for one and only one collector to add to a short set of Wisconsin Leaf Errors.

Sometimes you get to name an error coin. This high grade struck on a defective planchet error coin looks like Pac-Man so that is what I named it.

This is a really cool 1962 Franklin Silver Half Dollar struck on a defective planchet. It looks like the planchet had a lamination issue before the strike making this a struck on a defective planchet error and not a post strike lamination error.

This is a very interesting struck on a defective planchet error. This defective planchet error coin has a long crack, a blowhole, and missing partial clad layer. The multiple errors makes this coin an outstanding example of this type of error.

Here is an extreme example of a struck on defective planchet error. This coin has a very high grade for this type of error which just adds to its collectability.

It is nice to find a major error on an ultra modern coin. This 2023 Shield Cent has defective plating before the strike making this another rare Shield Cent struck on a defective planchet.