Countermark

https://rpc.ashmus.ox.ac.uk/countermark/171 
GIC 50
two facing bearded busts (M. Aurelius and L. Verus?); on reverse
rectangular 
7 x 4 mm 
Ptolemais (Phoenicia)
on coin of Ptolemais, but might not have been applied there? 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC III, 3911 Show 3911 5 3