I collect coins also, and this is one of the three made. The mint in Denver made 3000 of one kind of error, and 3500 of another kind of error, but they were not made in error, but made to keep the intrest up for the state quarters. The errors were then sent to the state of Arizona. This is the second clue that it is a real one. At a show this week end in Vegas the set of three sold in sets for $700-$1000.