Watch List notes:

Abbasid, temp. Ibrahim (b. al-Mahdi), rival caliph at Baghdad (Muharram, 202h- Dhu'l-Hijja, 203h), anonymous silver dirham, Madinat al-Salam 202h, rev. letters alif and ha in lower field, wt. 2.88gms. (A.B225; Lowick 1428), good very fine and rare
Ibrahim was briefly declared caliph at Baghdad while al-Ma'mun was still residing at Marw.