Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1538 
GIC
open hand
rectangular 
6 x 3 mm 
see D W MacDowall “Countermarks of early imperial Corinth” NC⁷ (1962), 113-23 at 121 (pl.9, 1) 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1116 Show 1116 90 1
RPC I, 1116 Show 1116 91 1
RPC I, 1116 Show 1116 92 1
RPC I, 1116 Show 1116 93 1