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, extremely rare in decorative design of the coin for this period. Choice EF. Extremely rare.
Estimate: 50 USD