Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1371 
GIC
star with five rays
circular 
4.5–5 mm 
no certainty this group are the same type, but possible 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 1881 Show 1881 3 3
RPC III, 1154 Show 1154 14 3
Show 58