Islamic - Umayyad & Abbasid,ABBASID: al-Mamun, 810-833, AR dirham (2.99g), Wasit, AH200, A-223.4, Lowick-1485, citing al-Hasan below the obverse field, Dhul-Riasatayn below reverse (with the additional letter K below), very rare mint for al-Mamun, choice VF, RR.
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