Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. al-Mahdi. AH 158-169 / AD 775-785. AR Hemidrachm (23mm, 10h) (23.5mm, 1.96 g, 9h). Issue of Umar ibn al-'Ala, governor (AH 154-163 / AD 771-780). Fourth Series. Tabaristan mint. Dated PYE 1245 = AH 159 (AD 775/6). Stylized crowned Sassanian style bust right; 'wml in Pahlavi to right; 'pd and 'lwn in Pahlavi in outer margin / Fire altar flanked by attendants; pellets flanking flames; alternating triple pellets and star-in-crescents in outer margin. Malek 73.1-7; Album 57; ICV 104. Iridescent toning. EF.