Countermark

https://rpc.ashmus.ox.ac.uk/countermark/297 
GIC 170
(helmeted) head r.
circular (or slightly oval) 
6 mm 
Sometimes on reverse. According to RPC "he head, described by Howgego (GIC 170) as perhaps Apollo or a female, seems probably to be a helmeted head (most clearly on 4444/10 and 4445/2), i.e., a head of Athena as on the small 'pseudo-autonomous' bronzes, 4417–31" 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4444 Show 4444 3 1
RPC I, 4444 Show 4444 4 1
RPC I, 4445 Show 4445 2 1
RPC I, 4446 Show 4446 1 1
RPC I, 4444 Show 4444 1 1
RPC I, 4444 Show 4444 10 1
RPC I, 4444 Show 4444 11 1
RPC I, 4444 Show 4444 12 1
RPC I, 4444 Show 4444 13 1