Countermark

https://rpc.ashmus.ox.ac.uk/countermark/594 
GIC 466
star and crescent
Sometimes on reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 2979 (temporary) Show 3792 1 4.2
RPC IV, 2191 (temporary) Show 2962 1 4.2
RPC IV, 2143 (temporary) Show 3782 1 4.2
RPC IV, 2492 (temporary) Show 3783 2 4.2
RPC IV, 9986 (temporary) Show 3789 2 4.2
RPC IV, 2150 (temporary) Show 3794 2 4.2