Countermark

https://rpc.ashmus.ox.ac.uk/countermark/233 
GIC 110
laureate head r.
circular 
7 mm 
Noted on coins of Ancyra (Galatia) and Pessinus, so possibly might have been applied at Pessinus? Possibly connected with Caracalla's journey to the east in 215. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC V.3, — (number not assigned), type ID 72010 Show 1213 11 5.3
RPC V.3, — (number not assigned), type ID 72212 Show 1204 1 5.3
RPC V.3, — (number not assigned), type ID 72258 Show 1237 1 5.3
RPC V.3, — (number not assigned), type ID 72638 Show 1101 1 5.3
RPC V.3, — (number not assigned), type ID 72712 Show 1192 1 5.3
RPC V.3, — (number not assigned), type ID 72898 Show 1132 1 5.3
RPC V.3, — (number not assigned), type ID 73365 Show 1439 2 5.3
RPC V.3, — (number not assigned), type ID 73369 Show 1412 1 5.3
RPC V.3, — (number not assigned), type ID 73343 Show 1432 1 5.3
RPC V.3, — (number not assigned), type ID 72729 Show 1135 2 5.3
RPC V.3, — (number not assigned), type ID 92797 Show 1143 1 5.3
RPC V.3, — (number not assigned), type ID 72115 Show 1046 2 5.3
RPC V.3, — (number not assigned), type ID 95106 Show 1397 1 5.3