Countermark

https://rpc.ashmus.ox.ac.uk/countermark/601 
GIC 474
thunderbolt
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 3914 Show 3914 11 3
RPC III, 3911 Show 3911 29 3
RPC III, 3911 Show 3911 28 3
RPC III, 3914 Show 3914 15 3
RPC III, 3914 Show 3914 14 3
RPC III, 3911 Show 3911 24 3