Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1506 
GIC
head r. in oval punch
oval 
6.5 - 7 mm 
Seems different from GIC 54, which has an oval punch of 6 x 4.5 mm 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1708 Show 1708 17 1
RPC I, 1708 Show 1708 20 1