Watch List notes:

Islamic coins, Abbasid, Harun al-Rashid, dirham, San'a' 183h, rev. field: alif fa, kaf or mim alif/-/Yazid, wt. 1.11gms. (Lowick 546 for date), chipped, clipped, otherwise fine, very rare. This dirham from the mint of San'a' is of the highest rarity. Judging by its frail fabric it is no surprise that so few have survived and that they are so rarely encountered.