Countermark

https://rpc.ashmus.ox.ac.uk/countermark/542 
GIC 420
lyre
shaped 
6 mm long 4 mm wide at base 3mm wide at top 
 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 1717 Show 1717 25 3
RPC III, 1704 Show 1704 1 3