Countermark

https://rpc.ashmus.ox.ac.uk/countermark/916 
GIC 800
denominational mark Δ
Incuse 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 2948 Show 2948 2 3
RPC III, 2947 Show 2947 8 3
RPC III, 2946 Show 2946 1 3
RPC III, 2947 Show 2947 2 3
RPC III, 2949 Show 2949 2 3
RPC III, 2946A Show 2946 2 3
RPC III, 2947 Show 2947 5 3
RPC III, 2947 Show 2947 11 3