Countermark

https://rpc.ashmus.ox.ac.uk/countermark/234 
GIC 111 i
laureate (?) head r.
shaped 
8 mm at longest point 
possibly applied at Antioch (Syria). Head might represent Caligula, under whom no bronze coins were struck at Antioch. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3868 Show 3868 31 1
RPC I, 3868 Show 3868 26 1
RPC I, 3868 Show 3868 35 1
RPC I, 4261 Show 4261 5 1
RPC I, 4264 Show 4264 3 1
RPC I, 4247a Show 4247 2 1
RPC I, 3868 Show 3868 46 1