That charm is interesting kind of coin charms (or coines turned to charms - F.Shjoth). On the obverse is placed legend Wu Hsing Ta Pu [up to down, right to left] of the Nothern Chou dynasty (a.d.557-581) coin [S246]:
|In the 3rd year of the Chien Te (a.d.575), the Emperor Wu cast the Wu Hsing Ta Pu ("Great Currency of the Five Elements"), one equivalent to ten, circulating jointly with the Pu Ch'uan, casted from a.d.561|
|Actual size is 28 mm|
There is interesting question: "Why Chinese image of the Ursa Major is the same as in western astronomy - as Dipper or Ladle?". Did that interpretation of stars position came to Europe from China or Chinese Charms with Ursa Major were casted when Chinese already knows Europian astronomy basics?Once more Wu Hsing Ta Pu images I received from Mr. Y.K.Leung.