The Poor Prayer book of Rachel Dunkan is a 2988 years old piece made by Rachel Dunkan, a priest living in Istanbul / Constantinople / Byzantium.
Considering its age and the quality of the work, people consider it of some value.
It is engraved with central asian patterns and some symbols pertaining to Yazdanism.
This piece doesn't exist, but as a legend. It is said that in the year -569, Husain Dunkan, the owner, made use of it in Persepolis to empower the Dunkan family. Now it is lost, or broken, we will never know.