Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1525 
GIC —
?, 'vase' or 'cantharos' in circular serrated border
circular 
6 mm 
Maronea (Thrace)
differs from GIC 485 as has indented border to the punch 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 9325 (temporary) Show 2083 3 4.1