Countermark

https://rpc.ashmus.ox.ac.uk/countermark/732 
GIC 606
ΑΡ monogram
square 
6.5 to 7 mm 
applied on coins of S C series 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4264 Show 4264 14 1
Show 46
RPC I, 4277 Show 4277 16 1