Countermark

https://rpc.ashmus.ox.ac.uk/countermark/57 
GIC 815
denominational mark Ϛ
circular 
5.5 mm 
applied to smaller coins of c. 19 to 22 mm diameter 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IX, 761 Show 761 2 9
RPC X, — (number not assigned), type ID 61584 Show 2062 6 10
RPC X, — (number not assigned), type ID 61592 Show 2065 8 10
RPC VI, 10881 (temporary) Show 4355 2 6
RPC X, — (number not assigned), type ID 61697 Show 2131 3 10
RPC X, — (number not assigned), type ID 61696 Show 2135 16 10
RPC X, — (number not assigned), type ID 61696 Show 2135 33 10