CategoriesBrockages![]() Counterbrockages ![]() Die Adjustment Strikes ![]() Die Caps ![]() Die Trials ![]() Double Denomination ![]() Double/Multiple Strikes ![]() Dual Countries ![]() Experimental Blanks ![]() Experimental Strikes ![]() Experimental Surface ![]() Feeder Finger Strikes ![]() Gold Die Trials ![]() Gold Errors ![]() Gold Off-Metals ![]() Intentional Errors ![]() Martha Washington Test Pieces ![]() Mated Pairs ![]() Mules ![]() Multiple Errors ![]() Off-Centers ![]() Off-Metals ![]() Overstrikes ![]() Pattern Die Trials ![]() Pattern Errors ![]() Pattern Mules ![]() Platinum Errors ![]() Proof Errors ![]() Specimens ![]() Spectacular Errors ![]() Transitional Errors ![]() Two-Headed Coins ![]() Two-Tailed Coins ![]() Uniface Die Trials ![]() Unique Coins |
![]() ![]() ![]() Spectacular ErrorsThis unique 1970-S Proof Quarter from the United States was over-struck on a 1941 Quarter from Canada. This mint error was originally discovered in a group of San Francisco Proof Errors that was auctioned by the State of California. There is a significant amount of detail on both sides showing the design of the Canadian Quarter. This is one of the most fascinating and intriguing proof mint errors ever discovered. ![]() ![]() ![]() |