Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1140 
GIC
helmeted head, r.
rectangular or quadrilateral 
5.5 x 3.5 mm 
no certainty applied at Gaba 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 3948 Show 3948 4 3
RPC III, 3948 Show 3948 3 3