UMAYYAD: Interregnum in Spain, 750-756, AR dirham (2.68g), al-Andalus, AH135, A-142Z, struck between the Umayyad departure from Syria to Spain and the accession of 'Abd al-Rahman I of the Umayyads of Spain in AH138/756, appreas to have been struck on slightly irregular flan (the edges suggest that this is not a cut from the original strike), EF, RRR.
Estimate: $1500-2000