First Dated Coins
The first dated coins that can be assigned to the Muslims are copies of silver Dirhams of the Sassanian ruler Yazdegerd III, struck during the Caliphate of 'Uthman. These coins differ from the original ones in that an Arabic inscription is found in the obverse margins, normally reading "In the Name of Allah". The subsequent series was issued using types based on drachmas of Khosrau II, whose coins probably represented a significant proportion of the currency in circulation. In parallel with the later Khosrau-type Arab-Sassanian coins first issued under the Well-Guided Caliphs of Islam, a more extensive series was struck with Khosrau's name replaced by that of the local Arab governor or, in two cases, that of the Caliph. Historical evidence makes it clear that most of these coins bear Hijra dates. The earliest Muslim copper coins are anonymous and undated but a series exists which may have been issued during the Caliphates of 'Uthman or 'Ali. These are crude copies of Byzantine 12-nummi pieces of Heraclius from Alexandria.
Read more about this topic: Islamic Gold Dinar
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