Countermark

https://rpc.ashmus.ox.ac.uk/countermark/940 
GIC 822
denominational mark Η
circular 
8 mm 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 4871 (temporary) Show 4099 1 4.1
RPC V.2, — (number not assigned), type ID 65343 Show 401 1 5.2
RPC VI, 30234 (temporary) Show 2844 1 6