Countermark

https://rpc.ashmus.ox.ac.uk/countermark/602 
GIC 475
thunderbolt
rectangular 
5.5 - 6 * 3.5 mm 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 2218 Show 2218 8 2
RPC II, 2218 Show 2218 16 2
RPC II, 2218 Show 2218 17 2
Show 131