Countermark

https://rpc.ashmus.ox.ac.uk/countermark/598 
GIC 471
thunderbolt
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 5831 (temporary) Show 998 2 4.3
RPC IV, 6158 (temporary) Show 993 3 4.3
RPC IV, 5831 (temporary) Show 998 9 4.3