Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1613 
GIC
head (of emperor?) with thin neck, r.
oval 
8 x 7 mm 
separated from GIC 58 as in circular, larger punches 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1111 Show 1111 23 1
RPC I, 1101a Show 1101 16 1
RPC I, 1101a Show 1101 17 1
RPC I, 1101a Show 1101 15 1