Countermark

https://rpc.ashmus.ox.ac.uk/countermark/708 
GIC 582
ϹΑΓ
rectangular 
6 x 3 mm 
GIC gave CAI (possibly ϹΑΓ), but further examples give CΑΓ as more likely. GIC also gave "possibly the same letters as GIC 581, but with the last two not ligatured". with ϹΑΓ as an optional reading. These were in the "Two or more Latin letters" section, but, with the Γ should be moved to the "Two or more Greek letters" section 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC V.3, — (number not assigned), type ID 68447 Show 4017 10 5.3
RPC V.3, — (number not assigned), type ID 68447 Show 4017 9 5.3
RPC V.3, — (number not assigned), type ID 68446 Show 4019 8 5.3
RPC V.3, — (number not assigned), type ID 68446 Show 4019 16 5.3
RPC V.3, — (number not assigned), type ID 68446 Show 4019 17 5.3
RPC V.3, — (number not assigned), type ID 68446 Show 4019 19 5.3
RPC V.3, — (number not assigned), type ID 68446 Show 4019 21 5.3
RPC V.3, — (number not assigned), type ID 68455 Show 4023 8 5.3
RPC V.3, — (number not assigned), type ID 68455 Show 4023 6 5.3
RPC V.3, — (number not assigned), type ID 68459 Show 4026 2 5.3
RPC V.3, — (number not assigned), type ID 68459 Show 4026 3 5.3
RPC V.3, — (number not assigned), type ID 68450 Show 4030 4 5.3
RPC V.3, — (number not assigned), type ID 68450 Show 4030 5 5.3
RPC V.3, — (number not assigned), type ID 68446 Show 4019 11 5.3
RPC V.3, — (number not assigned), type ID 78198 Show 4029 3 5.3
RPC V.3, — (number not assigned), type ID 68455 Show 4023 5 5.3
RPC V.3, — (number not assigned), type ID 78198 Show 4029 1 5.3