Expert: Joe Hylas - 10/7/2011

Question
I have recently found a 1990 p quarter with an mirror image of the reverse of a roosevelt dime, on the obverse of the quarter. In other words, I have a quarter with an incused image of a roosevelt dime on the front. The reverse(back) of the quarter is normal. I'm geussing a dime got stuck to the obverse die of the quarter and struck through it; as I have not mention yet, under the image of the incused dime the quarter is still apparent in detail. My question is; have you ever heard of this error, what kind of error is it, and what kind of value would you say it holds?(sorry i dont have any pic's thats why I tried to describe it so well.) thx,kyle

Answer
These are often referred to as "double denomination" strikes.

Check on ebay for similar items and value.  It would make sense to contact the Numismatic Guarantee Corporation to have the coin certified and encapsulated.  Thsi way, it is easier to sell and will bring a better price when you decide to sell it.

Regards
Joe Hylas