Countermark

https://rpc.ashmus.ox.ac.uk/countermark/292 
GIC 163
(radiate?) head r.
oval 
5 x 4 mm 
Perinthus (Thrace)
the head might be radiate like GIC 51, although that is later and in a larger punch 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 705 Show 705 4 3