Administrative Reforms
'A standard Arabic coinage was developed to replace the Byzantine and Sassanian types.'
During the caliphate of ‘Abd al-Malik bin Marwan (r. 65–86 / 685–705), a policy of administrative and political centralisation was initiated. A standard Arabic coinage was developed to replace the Arab-Byzantine and Arab-Sassanian types which had been used up to this time.
Coin (dirham)

Hegira 72 / AD 692
Umayyad
Jordan National Bank Numismatic Museum
Amman, Jordan
A silver pictorial dirham of the Arab-Sassanian type used during the period before the Umayyad coin reform by the caliph 'Abd al-Malik in 77 / 696–7.