Countermark

https://rpc.ashmus.ox.ac.uk/countermark/152 
GIC 32
ΝƐ, emperor, head r.
rectangular 
6 x 5.5 mm 
the inscription should probably be read as Ne(apolis) rather than Ne(rva) 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 2219 Show 2219 7 2
RPC II, 2224 Show 2224 1 2