Countermark

https://rpc.ashmus.ox.ac.uk/countermark/179 
GIC 57 ii
Octavian|Augustus, head r., with termination Ξ (thunderbolt?)
oval 
12 x 9 mm 
on coins of Messene 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
Show 33
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Show 207
Show 213