Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1315 
GIC
female head r., in oval punch (on reverse)
oval 
5.5 x 4.5 mm 
on a coin of Tiberius from Perge 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3369 Show 3369 4 1