Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1623 
GIC
(helmeted?) head l., uncertain object or letters behind
circular 
6 mm 
possible that the head might be Mên on crescent, but uncertain. This would imply Antioch (Pisidia) as coupled with the {ANT}I monogram 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3869 Show 3869 16 1