Countermark

https://rpc.ashmus.ox.ac.uk/countermark/235 
GIC 111 ii
bare head r.
shaped, angular 
7 x 6 mm 
possibly applied at Antioch (Syria). Head might represent Caligula, under whom no bronze coins were struck at Antioch; on reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3868 Show 3868 29 1