Countermark

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

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 2979 (temporary) Show 3861 1 4.2
RPC IV, 2191 (temporary) Show 3015 1 4.2
RPC IV, 2143 (temporary) Show 3850 1 4.2
RPC IV, 2492 (temporary) Show 3851 2 4.2
RPC IV, 9986 (temporary) Show 3854 3 4.2
RPC IV, 2150 (temporary) Show 3860 2 4.2