ABBASID: AE fals (3.07g), Nasaf, AH157, A-A330, Zeno-102443, Nastich-23, horse in obverse center, prancing left, mint date formula around // citing the governor al-'Abbas b. …, with a reference to the caliph al-Mahdi, an extremely rare Central Asian mint, VF, RRR. The date is clearly 157, not 159, and this example is superior to all specimens cited by Nastich.
Estimate: USD 200 - 300