Countermark

https://rpc.ashmus.ox.ac.uk/countermark/183 
GIC 61
male head r.? (on reverse)
circular 
On reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 3458 (temporary) Show 2536 2 4.2
RPC IV, 3458 (temporary) Show 2536 1 4.2