The coins are indeed Byzantine. The are know as billon trachy and were struck from the middle 11th - 13th centuries. The obverse usually depicts Christ enthroned with the legend IC-XC or Mary enthroned holding baby Jesus with the legend MP-OV. The Reverse depicts the emperor on the left facing and either a saint or angel on the right. From what I can tell they are mostly of the emperor Manuel I, 1143-1180 and one that could be Andronicus I, 1183-1185. The coins all appear to have been clipped or cut which was done during the Latin Rule period from 1204- 1261.





















