Countermark

https://rpc.ashmus.ox.ac.uk/countermark/553 
GIC 432
star of six rays
circular 
On obverse and on reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1305 Show 1305 3 1
RPC I, 3367B Show 3367 2 1
RPC I, 1305 Show 1305 1 1
RPC I, 1305 Show 1305 2 1