Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1028 
GIC
ΤΛ
incuse 
4 mm high x 5 mm wide 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 907 Show 907 1 2
RPC II, 906 Show 906 6 2