Countermark

https://rpc.ashmus.ox.ac.uk/countermark/666 
GIC 537
ΘƐϹ
rectangular 
6 x 3.5 mm 
Thessalonica (Macedonia)
GIC notes that the countermark was probably applied in A.D. 68/69, giving a civic sanction to the coins of Nero. 
List of countermarks View on a map

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC I, 1596A Show 1596 2 1
RPC I, 1599 Show 1599 1 1
RPC I, 1599 Show 1599 2 1
RPC I, 1600 Show 1600 1 1
RPC I, 1600 Show 1600 2 1
RPC I, 1600 Show 1600 3 1
RPC I, 1599A Show 1599 1 1
RPC I, 1593 Show 1593 6 1
RPC I, 1592 Show 1592 8 1
RPC I, 1600 Show 1600 10 1
RPC I, 1602 Show 1602 13 1
RPC I, 1603 Show 1603 11 1
RPC I, 1603 Show 1603 13 1
RPC I, 1602 Show 1602 14 1