Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1186 
GIC
B.PQ (?)
rectangular 
12 x 7 mm 
Kremydi-Sicilianou, based on a reading of B Q, proposed B as a name an Q of Q(uaestor) 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1509 Show 1509 21 1
RPC I, 1509 Show 1509 1 1
RPC I, 1509 Show 1509 22 1