https://rpc.ashmus.ox.ac.uk/countermark/1403 

GIC —

Capricorn r., star above back (on obverse)

oval 

5.5 x 4 mm 

Mysomakedones (Lydia)

similar to GIC 300, but unlikely to be the same with applications at Apamea (Bithynia) and Mysomakedones (Lydia). In addition GIC 300 applied to reverse, these are applied to the obverse