https://rpc.ashmus.ox.ac.uk/countermark/708 

GIC 582

ϹΑΓ

rectangular 

6 x 3 mm 

Paltus (Syria)

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