Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1765 
GIC —
Artemis the huntress standing r., drawing arrow, holding bow
circular 
8.5 mm 
Chersonesus (Bosporus)
similar to GIC 230, but larger punch and no dots; on a Severan, rather than Flavian type 
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Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber