Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1521 
GIC —
lyre
square with rounded corners 
6 x 6 mm 
Uncertain (Uncertain)
different shaped and sized punch from GIC 420 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 2821 Show 2821 1 2