Countermark

https://rpc.ashmus.ox.ac.uk/countermark/283 
GIC 154
imperial (?) head l.
circular 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 2088 Show 2088 3 2
RPC II, 2088 Show 2088 7 2
RPC II, 2089 Show 2089 4 2
RPC II, 2089 Show 2089 14 2
RPC I, 4757 Show 4757 12 1