Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1526 
GIC —
mark of value Ις (16)
circular 
9.5 mm 
Prusias ad Hypium (Bithynia)
This was noted by Johnston, p. 175 cmk no. C93 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC V.2, — (number not assigned), type ID 69315 Show 435 1 5.2