Byzantine
Justinian I (527-565 AD) Constantinople
AE Follis (40.6mm, 23.1g)
Obv: DN IVSTINI ANVS PP AVC
Rev: M, B below, year X/U, CON in exergue, large thin flan,
(S.163, DOC.40a, BMC 56-57); together with a similar example (21.48 g), officina **D*, (S.163, DOC 40d, BMC 61).