Countermark

https://rpc.ashmus.ox.ac.uk/countermark/824 
GIC 705
J.M. (=? ST.M.)
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1629 Show 1629 17 1
RPC I, 1635 Show 1635 20 1
RPC I, 1554 Show 1554 97 1