Countermark

https://rpc.ashmus.ox.ac.uk/countermark/752 
GIC 629
monogram ΠΡΟ?
circular 
9 mm 
Considered more likely Prusias than Prusa due to similarities to GIC 630 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC X, — (number not assigned), type ID 74281 Show 821 1 10
RPC X, — (number not assigned), type ID 74508 Show 868 3 10
RPC X, — (number not assigned), type ID 74508 Show 868 11 10
RPC X, — (number not assigned), type ID 74249 Show 803 4 10
RPC X, — (number not assigned), type ID 74508 Show 868 22 10
RPC X, — (number not assigned), type ID 74526 Show 825 2 10
RPC X, — (number not assigned), type ID 74489 Show 871 19 10
RPC X, — (number not assigned), type ID 74470 Show 879 1 10