Countermark

https://rpc.ashmus.ox.ac.uk/countermark/635 
GIC 508
unclear
rectangular 
2.5 x 3 mm 
Gabala (Syria)
may be the same as GIC 246 (Athena standing), but the punches are smaller and the type obscure 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 3809 Show 3809 3 3