Countermark

https://rpc.ashmus.ox.ac.uk/countermark/654 
GIC 527
ΓΑΛ.ΚΑΙ
rectangular 
13 x 4 mm 
Same cmk as Martini, Pangerl 93. Galba Caesar. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1753 Show 1753 4 1
RPC I, 1754 Show 1754 15 1
RPC I, 1754 Show 1754 16 1
RPC I, 1758 Show 1758 1 1
RPC I, 1753 Show 1753 5 1
RPC I, 1758 Show 1758 5 1
RPC I, 1758 Show 1758 6 1
RPC I, 1761 Show 1761 6 1
RPC I, 1761 Show 1761 7 1
RPC I, 2083B Show 2083 1 1
RPC I, 1754 Show 1754 19 1
RPC I, 1754 Show 1754 21 1
RPC I, 1753 Show 1753 8 1
RPC I, 1960 Show 1960 2 1
RPC I, 1754 Show 1754 22 1
RPC I, 1758B Show 1758 1 1
RPC I, 1761 Show 1761 12 1
RPC I, 1753 Show 1753 10 1
RPC I, 1754 Show 1754 23 1
RPC I, 1761A Show 1761 3 1