Graffitti on the reverse.
Byzantine Empire
Justinian I (527–565), Solidus 542-552, Constantinople mint, 1st officina
Obverse: the bust of the emperor straight ahead
D N IVSTINIANVS P P AVG
Reverse: an angel standing in front of him, holding a long cross and an apple with a cross, in episode CONOB, star in field
VICTORIA AЧGGG A
Gold, diameter 20 mm, weight 4.36 g