Just what is a UFO die variety? For the Wexler Files a UFO die variety is an Unidentified Fascinating Oddity. These do not fit into the typical categories of varieties such as doubled dies or repunched mint marks, however, there is something unusual about the variety that warrants listing along with some publicity. In some cases die variety specialists have discussed the abnormality without agreement as to what caused the abnormality.
This category of die variety will not be a dumping ground for minor errors such as die chips, die cracks, and/or die clashes.