ISLAMIC, 'Abbasid Caliphate. Al-Radi, AH 322-329 / AD 934-940. Dirham (Silver, 26 mm, 3.36 g, 1 h), mule type consisting of two slightly different reverses. Within a circle, ‘li-llāh / Muḥammad / rasūl / Allāh / al-Rāḍī billāh’ (‘To Allah. Muhammad is the messenger of Allah. al-Radi billah’ in Arabic); in the margin, ‘Muḥammad rasūl Allāh arsalahū bi al-hudā wa dīn al-ḥaqq liyuẓhirahū ʿalā al-dīn kullih wa law kariha al-mushrikūn’ (‘Muhammad is the messenger of Allah. He sent him with guidance and the religion of truth, so that He may make it overcome all religions, even though the unbelievers may dislike it’ in Arabic). Rev. Within two concentric circles, ‘li-llāh / Muḥammad / rasūl Allāh / al-Rāḍī billāh / amīr al-muʾminīn’ (‘To Allah. Muhammad is the messenger of Allah. al-Radi billah. Commander of the Believers’ in Arabic); margin same as the obverse margin. Album 255.1. An extremely rare hybrid issue. Darkly toned. Areas of weakness, otherwise, very fine.