Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1201 
GIC —
N or Z
square 
5.5 mm 
Germe (Mysia)
no certainty cmk applied at Germe 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC VII.1, 112.1 Show 112.1 7 7.1