Countermark

https://rpc.ashmus.ox.ac.uk/countermark/747 
GIC 624
ΝΕΡ, ΝΕ, or inverted ΝΕ
Nero 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1016 Show 1016 3 1
RPC I, 1017 Show 1017 2 1
RPC I, 1018 Show 1018 1 1
RPC I, 1018 Show 1018 8 1
RPC I, 1019 Show 1019 7 1
RPC I, 1019 Show 1019 10 1
RPC I, 1019 Show 1019 12 1