The Decayed Brooch of Wongsojoyo Wedgewood is a 631 years old piece made by Wongsojoyo Wedgewood, a bailiff living in Ulaanbaatar.
Considering its age and the quality of the work, people consider it of no value.
It is engraved with asian patterns and some symbols pertaining to Confucianism.
This piece doesn't exist, but as a legend. It is said that in the year 1393, Banyong Wedgewood, the owner, made use of it in Ulaanbaatar to empower the Wedgewood family. Now it is lost, or broken, we will never know.