Countermark

https://rpc.ashmus.ox.ac.uk/countermark/62 
GIC 226
two turreted figures
circular 
8 mm 
Origin of the coins and their circulation suggests cmk is Sardian. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IX, 903 Show 903 1 9
RPC VIII, 1081 Show 1081 2 8
RPC VIII, 1081 Show 1081 11 8
RPC VI, 3996 (temporary) Show 3406 1 6
RPC VI, 4714 (temporary) Show 3890 3 6
RPC VIII, 1379 Show 1379 1 8
RPC VII.1, 237.1 Show 237.1 25 7.1
RPC VII.1, 237.2 Show 237.2 26 7.1