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2004-D Wisconsin Extra Leaf Quarters.
These dramatic errors were discovered in late 2004 by Bob Ford in Tucson Arizona. Within a year they became the subject of extreme speculation and debate over their cause.
Now, over ten years later, they are known to have been deliberately created at the Denver Mint by someone who sabotaged two different dies with a small tool.
Their overall rarity has now been determined to be similar to that of classic die errors like the 1955 Doubled die cent and 1937-D 3-leg Buffalo nickel.
Video on how they were made Video on their rarity
Eagle Eye Rare Coins