The correct “face value/currency” for Obol coins of Sasanian Empire is Dang not Obol. In deed, Dang is the Iranian variant of Obol. So, please change the nomination to the mentioned face value or use Dang in parentheses with Obol. Sincerely, M. Samei
https://en.wikipedia.org/wiki/Sasanian_coinage
https://www.numisbids.com/sale/8527/lot/91
https://www.numisbids.com/sale/8527/lot/101