Countermark

https://rpc.ashmus.ox.ac.uk/countermark/639 
GIC 512
ΑΔΡΙ
Tomis (Moesia)
Hadrian; noted for a coin of Trajan from Tomis. No photo in GIC. AMNG vol.12 p.626: A. M. Gilevich "Ancient coins from other cities from excavations at Chersonesus. Numismatica i Sfragistka 3 (1968), 3-61, at 25-6 and 52 (in Russian) 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 779 Show 779 13 3
Show 11