Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1706 
GIC —
laureate head r.
circular (or slightly oval) 
5.5 mm 
Uncertain (Uncertain)
on a coin of Pergamum. cmk is similar to GIC 69, but these are only noted for the reign of Septimius Severus 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC VI, 4219 (temporary) Show 3640 2 6