Arab Sasanian: silver 1/2 dirham / hemidrachm (1.97g), Tabaristan mint, PYE 136 (AH 171 / 787-788 CE). Anonymous type minted without the name of a governor, instead inscribed "AFZWT" in usual place of ruler's name. Minted under the Abbasid governors of Tabaristan. Album 73. Uncirculated.