Countermark

https://rpc.ashmus.ox.ac.uk/countermark/906 
GIC 778
denominational mark Γ
incuse 
6 mm (vertical x 4 mm (latera) 
Incuse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC VI, 5995 (temporary) Show 5556 3 6
RPC VI, 5992 (temporary) Show 5552 1 6
RPC VI, 10982 (temporary) Show 5553 1 6
RPC VI, 5995 (temporary) Show 5556 2 6