Rare Arcadius solidus with the CI marking on the obverse, this type of sign is less popular than many others.
Roman Imperial
Arcadius (383-408), Solidus 402-403, Constantinople mint
Obverse: bust of Arcadius, helmeted, pearl-diademed, cuirassed, facing front, holding spear in right hand behind head and shield decorated with horseman and enemy on left arm
D N ARCADIVS P F AVG
Reverse: helmeted Constantinopolis seated facing, head right, placing right foot on prow and holding sceptre and Victory on globe, CONOB in exergue
CONCORDIA AVGG CI
Gold, diameter 20 mm, weight 4.34 g