Countermark

https://rpc.ashmus.ox.ac.uk/countermark/902 
GIC 773
denominational mark Γ
incuse 
applied to worn coins with an additional countermark (GIC 34, 35 or 36) 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
Show 39
Show 40
Show 43
Show 18
Show 336
RPC VI, 4669 (temporary) Show 3830 8 6