Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1298 
GIC
on l., draped bust of Geta, r., on r., Telesphorus facing; inscription Π ϹΕ ΓΕΤΑϹ ΚΑΙ(ϹΑΡ) around in circular punch
circular 
11.5 mm 
applied to blank coins 

Coins with this countermark

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