Countermark

https://rpc.ashmus.ox.ac.uk/countermark/622 
GIC 497
?, 'helmet' (perhaps a facing radiate bust)
square 
5 x 5 mm 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3356 Show 3356 3 1
RPC I, 3356 Show 3356 6 1