A very small group of PROOF errors recently came from a collection that was auctioned by the State of California. The U.S. Secret Service inspected and released this collection to the State of California determining that it was legal to own. The State of California then auctioned the collection and it has been dispersed since the sale. In this collection were a few mint state major errors including this unique mated 3 piece off-metal brockage set.
A Cent struck on a Dime blank, which was intended to strike proof Dimes, remained in the collar and created two brockages on the next two blanks. These blanks were also Dime blanks and not Cent blanks. This is an incredible combination of multiple errors.