I like Sasanian coins and am trying to built a mint mark set for each emperor, a feet that will probably be impossible to complete. Here is an ugly obverse example of Khursu I 531-579 AD. It dates to year 37 (568 AD) and is from YZ mint (Yazd).
AR Drachm
30mm x 4.0g x 3h
What is nice about these coins is that the silver ranges from 85 to 99%, with some of the earlier rulers being lower. The lowest is about 5% in some coins of Shapur II.

