Okay, 3 quadrans, pretty darn nice! I reckon ill keep all of them - I'm definitely keeping the cresent moon and star, that was a great surprise.
First one, Thessalonica, 4 lines of text (I wont bother looking those up again), I reckon to be Caracalla; Second, cresent moon and 1 star, emperor unknown; lastly complete unknown. any help appreciated, but ill probably send all 3 to the british museum.

