The Standard Abacus of Bakshishum Kanitacox is a 2130 years old piece made by Bakshishum Kanitacox, a merchant living in Nishapur.
Considering its age and the quality of the work, people consider it of considerable value.
It is engraved with central asian patterns and some symbols pertaining to Judaism.
This piece doesn't exist, but as a legend. It is said that in the year 939, Farid Kanitacox, the owner, made use of it in Isfahan to empower the Kanitacox family. Now it is lost, or broken, we will never know.