Countermark

https://rpc.ashmus.ox.ac.uk/countermark/620 
GIC 495
'helmet'
couche shield 
c. 4.5 mm 
Pangerl 98. Attributed to Moesia and Thrace. Robert, Hellenica vol. 7, p. 239, attributed it to Mesembria. Seems to be always with GIC 577 and GIC 602. GIC had ?'helmet"; further example seem to confirm helmet 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 2235 Show 2235 47 1
RPC I, 2235 Show 2235 49 1
RPC I, 2235 Show 2235 50 1
RPC I, 2235 Show 2235 51 1
RPC I, 2235 Show 2235 52 1
RPC I, 2235 Show 2235 54 1
RPC I, 4100 Show 4100 35 1