Countermark

https://rpc.ashmus.ox.ac.uk/countermark/66 
GIC 796
denominational mark Δ in circular punch
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IX, 1000 Show 1000 2 9
RPC IX, 312 Show 312 5 9
RPC VII.1, 622.3 Show 622.3 12 7.1