The Decayed Abacus of Levi Kerubogil is a 3699 years old piece made by Levi Kerubogil, a merchant living in Eridu.
Considering its age and the quality of the work, people consider it of no value.
It is engraved with central asian patterns and some symbols pertaining to Folk religion.
This piece doesn't exist, but as a legend. It is said that in the year -861, Wazad Kerubogil, the owner, made use of it in Volubilis to empower the Kerubogil family. Now it is lost, or broken, we will never know.