The Grotesque Saber of Yasmin Dunkan is a 2485 years old piece made by Yasmin Dunkan, a general living in Persepolis.
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 1548, Dong Dunkan, the owner, made use of it in Tokyo to empower the Dunkan family. Now it is lost, or broken, we will never know.