Watch List notes:

Pre-reform issues, Tabaristan ('Abbasid governors). Abdallah b. Qahtaba. AH 174-175 / AD 790-791. AR Hemidrachm (22.1mm, 1.98 g, 9h). TPWLSTAN (Tabaristan) mint. Dated PYE 140 = AH 175 (AD 791/2). Name of governor before bust (without patronymic). Malek 130.2 (as 'Abdallah b. 'Arif); Album 70 (reattributed to 'Abdallah b. Qahtaba). EF, lustrous.

Ex Classical Numismatic Group Electronic Auction 454 (16 October 2019), lot 496.