Dating
162 AH (=AD 778-779)
Obverse
لا اله الا / الله و حده / لا شريك له, Arabic inscription in field, enclosed by Arabic inscription anti-clockwise from 1h, enclosed by three pointillate circles, six equidistant annulets of type '⦾', all enclosed by traces of pointillate circle
Reverse
محمد رسول / الله صلى الله / عليه و سلم / الخليفة المهدي / يحيى, Arabic inscription in field, enclosed by pointillate circle, enclosed by Arabic inscription (Sura 9:33) anti-clockwise in margin from 2h, all enclosed by traces of pointillate circle