Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1735 
GIC —
ΠXVF? monogram
https://rpc.ashmus.ox.ac.uk/coin/441842
circular 
on coins of King Amyntas of Galatia 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber