Countermark

https://rpc.ashmus.ox.ac.uk/countermark/882 
GIC 746
denominational mark Α
shaped 
11 mm high, 6 mm at base 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 490 Show 490 2 2
RPC II, 491 Show 491 23 2
RPC II, 491 Show 491 28 2