Countermark

https://rpc.ashmus.ox.ac.uk/countermark/566 
GIC 445
star of six rays in circular punch
On reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 2960 Show 2960 2 1
RPC I, 2960 Show 2960 4 1
RPC I, 2964 Show 2964 1 1
RPC I, 2960 Show 2960 5 1
RPC I, 2967 Show 2967 3 1
RPC I, 2967 Show 2967 4 1
RPC I, 2967 Show 2967 5 1
RPC I, 2967 Show 2967 6 1
RPC I, 2966 Show 2966 1 1
RPC I, 2966 Show 2966 3 1
RPC I, 2962 Show 2962 1 1
RPC I, 2962 Show 2962 5 1
RPC I, 2960 Show 2960 7 1