Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1516 
GIC
branch (oval punch)
oval 
6 x 5 mm 
different from GIC 382 as smaller and from GIC 386 as not between between Ϲ | Π, or C | U 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 4967 Show 4967 10 1