Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1027 
GIC
star on crescent
circular 
4 mm 
See GIC 463-6 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 1627 Show 1627 1 2
RPC II, 1627 Show 1627 18 2
RPC II, 1627 Show 1627 13 2
RPC II, 1627 Show 1627 17 2
RPC II, 1627 Show 1627 20 2