Countermark

https://rpc.ashmus.ox.ac.uk/countermark/701 
GIC 575
AV.C
Augusta Caesareia? 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4862 Show 4862 74 1
RPC I, 4862 Show 4862 89 1
RPC I, 4862 Show 4862 94 1