Countermark

https://rpc.ashmus.ox.ac.uk/countermark/745 
GIC 622
monogram ΜHΤΒ
Metropolis of Bithynia 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 604 Show 604 4 2
RPC II, 604 Show 604 6 2
RPC II, 612 Show 612 5 2
RPC II, 627 Show 627 5 2
RPC II, 629 Show 629 4 2
RPC II, 691 Show 691 2 2
RPC II, 691 Show 691 3 2
RPC II, 604 Show 604 10 2
RPC II, 612 Show 612 7 2
RPC II, 604 Show 604 11 2
RPC II, 604 Show 604 13 2