Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1254 
GIC 545 i
ΚΛ Θ
rectangular 
6 x 3 mm 
Claudius year 9. Differs from GIC 545 as is ΚΛ Θ not Κ Θ 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3658 Show 3658 3 1
RPC I, 3658 Show 3658 4 1
RPC I, 3658 Show 3658 1 1
RPC I, 3658 Show 3658 5 1
RPC I, 3658 Show 3658 7 1