Reformed Umayyads silver dirhems do not name the Caliphs, but the coin are dated which tells us under which Caliph they were struck.
Denomination : Silver Dirhem. Mint : Wasit.
Date : AH 123 (AD 741)
Reference : Mitchiner Islamic - 61
Size : 24.1 x 25.0 mm. Weight : 2.90 grams.
Grade : XF
Obverse and Reverse : Arabic inscriptions.