The Unique Theorem of Urvasi Museum is a 1723 years old piece made by Urvasi Museum, a mathematician living in Delhi.
Considering its age and the quality of the work, people consider it of the highest 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 283, Urvasi Museum, the owner, made use of it in Delhi to empower the Museum family. Now it is lost, or broken, we will never know.