Most likely Ummayad post reform; I can't read it, my Arabic is very primitive. But I'm quite sure by style it is Ummayad, my best guess. Good luck, not much else to go on as the inscriptions that surround the central inscription is totally unreadable unless some one is an expert.
The text in the centre is part of the Kalima: "lā ilāha illā-llāhu waḥdahu lā sharīka lahu". That does not help you with further attribution though.