Islamic - Umayyad & Abbasid,ABBASID: al-Mahdi, 775-785, AR dirham (2.64g), al-Yamama, AH166, A-215.1, inscribed hajar below the reverse field, bold strike, nearly XF, R. Al-Yamama was the first mint in Arabia to strike silver coins, located near the modern city of Riyadh, with its administrative capital at the town of Hajar. It operated AH165-170.
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