Countermark

https://rpc.ashmus.ox.ac.uk/countermark/657 
GIC 530
ΔΑΚ(Ι)(ΚΟϹ) - use one of the sub-marks
rectangular 
Metropolis (Ionia)
Dacicus. Do not use - spread between 530i, 530ii and 530iii 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber