Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1398 
GIC
lituus
shaped 
10 mm long 
different from GIC 419 as the head of the lituus is to the l. 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 3869 Show 3869 14 1
RPC I, 4272 Show 4272 19 1