The Grotesque Abacus of Ilozumba Onvaou is a 2713 years old piece made by Ilozumba Onvaou, a merchant living in Volubilis.
Considering its age and the quality of the work, people consider it of considerable value.
It is engraved with african patterns and some symbols pertaining to Ancient Egyptian religion.
This piece doesn't exist, but as a legend. It is said that in the year -703, Ilozumba Onvaou, the owner, made use of it in Volubilis to empower the Onvaou family. Now it is lost, or broken, we will never know.