The Historic Abacus of Hezekiah Haliorapo is a 3478 years old piece made by Hezekiah Haliorapo, a merchant living in Nishapur.
Considering its age and the quality of the work, people consider it of priceless value.
It is engraved with central asian patterns and some symbols pertaining to Zoroastrianism.
This piece doesn't exist, but as a legend. It is said that in the year -1407, Nethaneel Haliorapo, the owner, made use of it in Nishapur to empower the Haliorapo family. Now it is lost, or broken, we will never know.