Countermark

https://rpc.ashmus.ox.ac.uk/countermark/593 
GIC 465
star and crescent
oval 
6 x 4 mm 
May be the same as GIC 464 (Cyzicus) 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 28 (temporary) Show 550 1 4.2