The Historic Abacus of Nadia Ozen is a 3182 years old piece made by Nadia Ozen, a merchant living in Istanbul / Constantinople / Byzantium.
Considering its age and the quality of the work, people consider it of the highest value.
It is engraved with central asian patterns and some symbols pertaining to Ancient Mesopotamian religion.
This piece is a generous donation made to Istanbul / Constantinople / Byzantium in -1177 by Nadia Ozen, benefactor, who wanted that everyone enjoyed it.