Countermark

https://rpc.ashmus.ox.ac.uk/countermark/855 
GIC 731
XF or X̅?
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 2312 Show 2312 23 2
RPC II, 2312 Show 2312 24 2
RPC II, 2311 Show 2311 46 2