Countermark

https://rpc.ashmus.ox.ac.uk/countermark/519 
GIC 397
circle, incuse, with incuse dot in centre
circular 
6 mm 
on reverse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 6606 (temporary) Show 3061 1 4.3
RPC IV, 6608 (temporary) Show 3062 1 4.3
RPC IV, 6607 (temporary) Show 3059 1 4.3
RPC IV, 6729 (temporary) Show 3140 2 4.3