Countermark

https://rpc.ashmus.ox.ac.uk/countermark/147 
GIC 27
Eastern potentate, bust r.
oval 
7.5 x 6 mm 
attribution to Edessa likely, but not certaon 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4259 Show 4259 6 1
Show 10