Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1283 
GIC
laureate head or bust of Marcus Aurelius, r.; on obverse
rectangular 
8 x 6 mm 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4006 Show 4006 15 1
RPC I, 4011A Show 4011 1 1
RPC I, 4006 Show 4006 16 1