ER298 Very rare 1901-03 Fukien Mint Error — Two Dragon Sides Die Mule — Brass 5 CASH, NGC AU Details. Despite being cleaned as noted, this interesting and VERY RARE mint error features two dragon side dies–one with a long tail and one with a short tail–on either side. Brassy-olive in color and exceptionally enticing. Very rare and hard to find. Coins like this will make your collection stand out and shows your good taste. Shanghai museum also has one in their collection.