Countermark

https://rpc.ashmus.ox.ac.uk/countermark/155 
GIC 35
ϹΜΥΡ, Caracalla, bust r.
circular 
13 mm 
Smyrna (Ionia)
The countermarks show Caracalla both as a young man and as a mature man, indicating that they were applied over a period of time 
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Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber