Countermark

https://rpc.ashmus.ox.ac.uk/countermark/513 
GIC 393
caduceus head
oval 
6.5 x 5 mm 
but might have been applied at Tarsus 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 5031 (temporary) Show 1091 9 4.3
RPC IV, 5813 (temporary) Show 1084 3 4.3
RPC IV, 4994 (temporary) Show 1077 15 4.3
RPC IV, 5031 (temporary) Show 1091 11 4.3
RPC IV, 4994 (temporary) Show 1077 10 4.3
RPC IV, 4994 (temporary) Show 1077 9 4.3