Abbasid Caliphs of Bagdad, 780 AD. / 163 AH., Muhammad al-Mahdi, Madinat Al-Salaam mint, Dirham.

Abbasid Caliphate, Muhammad al-Mahdi (158-169 AH / 775-785 AD. ), Madina al-Salam mint (Baghdad, Iraq), 163 AH / 780 AD.,
Dirham (23-24 mm / 2,72 g),
Obv.: - Central Legend: لا اله ا ( there is no diety except) / الله وحده ( (the one) god alone) / لا شرك ل (he has no equal ) ,
- Marginal Legend: بسم الله ضرب هذا الدرهم بمدينة السلام سنة ثلث و ستين و مئةالخل (In The Name of God. This dirham was struck in Madinat al-Salam in the year three and sixty and one hundred (163)), on the edge: O oo O oo O oo .
Rev.: - Central Legend: • / محمد رسول (Muhammad is the Messenger) / الله صلى الله (of God, Gods Prayer) / عليه وسلم (and Salutations upon him (PBAH)) / الخليفة المهدي (The Caliph al-Mahdi) / •• ,
- Marginal Legend: محمد رسول الله ارسله بالهدى و دين الحق ليظهره على الدين كله ولو كره المشركون ( Muhammad is the messenger of God. He sent him with guidance and the true religion to reveal it to all religions even if the polytheists abhor it.) .
cf. http://www.zeno.ru/showphoto.php?photo=46824 .