Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1708 
GIC
complex design containing capricorn r., CO, large X ?
oval 
8.5 x 6 mm 
capricorn could be an overstamp on a previous cmk? 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 2318 Show 2318 5 3