Watch List notes:

ABBASID, al-Mahdi, AH 158-169 (AD 775-785). AE fals (2.68 gm; 22 mm). Sabur mint. No date. Minted in the name of the heir Musa, citing Salih b. Da'ud. Miles Persepolis 506-507; A-A205. Red patina. Choice Good VF. Very rare.