Countermark

https://rpc.ashmus.ox.ac.uk/countermark/314 
GIC 187
Athena, helmeted head r.
circular 
6 mm 
GIC 187 was applied to coins that, although ascribed in BMC p. I26 n. to the reign of Augustus, and this was followed, e.g., by AMC I 249-59. were excluded from RPC I as being late Hellenistic 

Coins with this countermark

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