Countermark

https://rpc.ashmus.ox.ac.uk/countermark/648 
GIC 521
ΓΑ | Β
oval 
8 x 5 mm 
Gaius, year 2 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4264 Show 4264 6 1
RPC I, 4272 Show 4272 13 1
RPC I, 3868 Show 3868 10 1
RPC I, 3869 Show 3869 13 1
RPC I, 4272 Show 4272 20 1
Show 298
RPC I, 4274 Show 4274 7 1