The Beautiful Compass of Cheng Museum is a 1027 years old piece made by Cheng Museum, a engineer living in Shanghai.
Considering its age and the quality of the work, people consider it of considerable value.
It is engraved with asian patterns and some symbols pertaining to Jainism.
This piece doesn't exist, but as a legend. It is said that in the year 979, Cheng Museum, the owner, made use of it in Shanghai to empower the Museum family. Now it is lost, or broken, we will never know.