I don't own many (or even any) Byzantines and this one is beyond my comfort zone. This came as one of three small coins that were part of a mixed batch of 37 coins I bought recently. I have had a stab at attribution but am looking for some confirmation of what I have concluded. I don't own any books covering this period and so am simply searching throug honline resources. I haven't found anything as a direct match but a few that are close. Justin I, AE Pentanummium Obv:- DN IVSTINVS PP AVG, pearl diademed, draped, cuirassed bust right Rev:- Delta (officina letter) to left, Epsilon (value mark) to right Minted in Constantinople? A.D. 512-518 1.66g. 14.01 mm. 180 degrees Regards, Martin
http://labarum.info/lbr/show.php?coin=750 Sear 75, officina a, b, gamma, delta known Doc 21a-d, bmc 40-46, bn 24-34, mib 32 (ref. coppied from Sear)