UMAYYAD: bronze fals (3.93g), AH 78-85. Umayyad post-reform fals overstruck on an Arab-Byzantine fals of Dimashq, standing emperor type. Remnants of the long cross and the cross-crown on the emperor's head are visible. Mint name Dimashq is completely visible. A-3517 (for host coin), A-153 (for overstrike). Nice example, very fine. Highly unusual, very rare.
This overstrike is of an early version of the Umayyad post-reform type with a single circle around the central legends. These early Umayyad post-reform falus, as Album notes, were an attempt to introduce a uniform system of bronze coinage. The host of the overstrike is an Arab-Byzantine fals, standing emperor type, mint of Dimashq (Damascus). The choice of the host coin supports the idea that the plain reform types were the earliest occurrence of the post-reform coinage in copper or bronze.
A similar case of an Umayyad post-reform overstrike is found in SARC 35 (lot 904), sold for $309, though it was overstruck on a Byzantine half follis, not an Arab-Byzantine fals.
Estimate: 300 - 350