Countermark

https://rpc.ashmus.ox.ac.uk/countermark/753 
GIC 630
monogram ΠΡΟΥ on blank coins
square 
6 x 6 mm 
on reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 687 Show 687 7 2
RPC II, 687 Show 687 6 2
RPC II, 687 Show 687 9 2
Show 122
Show 180
Show 117
RPC II, 687 Show 687 10 2
RPC II, 687 Show 687 11 2
RPC II, 687 Show 687 12 2