PCGS 1999-D Roosevelt dime overstruck on a Lincoln cent planchet. The coin is the weight of a normal cent, but was struck out of collar and expanded beyond the size of a cent. This error would only be possibly if it was struck out of collar, since a cent planchet is physically too large to fit into a dime size collar die. How it was produced at the Mint, as either the result of a Mint Employee’s tomfoolery, or perhaps a press that was switched from striking cents to dimes, and then a leftover cent planchet in the striking chamber was fed in and struck by the cent dies, no-one knows. 

This is one of only 2 known dimes struck on a full size cent planchet. There are perhaps 6 or so cents struck on “cut down” cent stock or are wrong stock errors (meaning they are not on full size cent planchets, but are either on cent stock or on cent planchets that were physically cut down to fit into a dime collar), but they are not on full size cent planchets. This coin is nearly unique as a result. The other example is a “die cap” dime on cent planchet, but it has a uniface reverse, and so is not struck on both sides as this coin is. 

A unique opportunity to own this important mint error rarity.

PCGS AU58 with mostly brown surfaces, but with nice luster. The coin was previously in a PCGS MS64 holder, and before that years ago it was in an NGC MS65.