Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1228 
GIC
square punch, no visible design (?)
square 
6 x 6 mm 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC VIII, — (number not assigned), type ID 20172 Show 997 1 8
RPC VIII, — (number not assigned), type ID 20172 Show 997 2 8