Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1432 
Martini, Pangerl 107 b
winged thunderbolt (rectangular punch)
rectangular 
8 x 5 mm 
applied in Syria to a) Tiberian dupondius and b) Vespasian dupondius 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC II, 1983 Show 1983 25 2
RPC I, 3868 Show 3868 16 1