Countermark

https://rpc.ashmus.ox.ac.uk/countermark/937 
GIC 820
denominational mark Η
Rectangular punch 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 3682 (temporary) Show 2961 5 4.1
RPC IV, 3682 (temporary) Show 2961 7 4.1
RPC IV, 3682 (temporary) Show 2961 4 4.1
RPC IV, 3682 (temporary) Show 2961 8 4.1
RPC IV, 3682 (temporary) Show 2961 11 4.1
RPC IV, 3682 (temporary) Show 2961 9 4.1
RPC IV, 3682 (temporary) Show 2961 6 4.1