Watch List notes:

ABBASID: al-Ma'mun, 810-833, AV dinar (4.28g), Misr, AH200, A-222.7, citing the local governor al-Sari, plus Tahir with his honorary title dhu'l-yaminin, "possessor of the two right hands", i.e., "ambidextrous, " which means here that he held both military and administrative leadership positions, superb strike, choice EF.

Estimate: 700-800 USD