Countermark

https://rpc.ashmus.ox.ac.uk/countermark/440 
GIC 318
animal suckling child in oval punch
oval 
8 x 5 mm 
its use on a much smaller diameter coin shows it was unlikely to be a denominational cmk 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC VI, 4210 (temporary) Show 3643 3 6
RPC V.2, — (number not assigned), type ID 1105 Show 2590 3 5.2
RPC V.2, — (number not assigned), type ID 1100 Show 2598 21 5.2
RPC V.2, — (number not assigned), type ID 1101 Show 2606 14 5.2
Show 307
RPC V.2, — (number not assigned), type ID 387 Show 2601 3 5.2