Watch List notes:

ABBASID, Khalif Al-Mahdi. Æ Fals (1.73 gm; 19 mm). obverse, Khalif's name as "Amir-al Mo"menin" (Commander of the ship of Faithfuls), reverse, mint "Besabur (Bishapur), followed by year 167 AH. Red patina. Choice VF. Extremely rare in decorative design of the coin for this period.
Estimate: 25 USD