Countermark

https://rpc.ashmus.ox.ac.uk/countermark/652 
GIC 525
(standard or poppy?)ΓΑΑΥ
Galba αὐτοκράτωρ or Augustus 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1758A Show 1758 1 1
RPC I, 2084 Show 2084 1 1
RPC I, 2085 Show 2085 1 1
RPC I, 2086 Show 2086 1 1
RPC I, 2083A Show 2083 1 1
RPC I, 2085 Show 2085 2 1
RPC I, 2084 Show 2084 2 1
RPC I, 2084 Show 2084 3 1
RPC I, 2084 Show 2084 4 1