I crave the knowledge of the experts once again. I picked up this Roman coin amongst a group of 40+ Roman coppers and bronzes. I was fairly sure I had it nailed as a Domitian Uncia from Antioch but then noticed the counterstamp of a figure with a spear on the neck. Is this a recognised variant or indication of a later copy? (Apologies for the colour cast - my camera occasionally decides to alter the colour balance on small coins - true colour is the right hand half of the image.) Measures about 22mm across and weighs about 6g.
the countermark is Howgego 245, Athena with spear and shield. Howgego writes - "the connection of Minerva with Domitian suggests that this is an imperial countermark. There can be little doubt that it was applied at Antioch between AD 83 (none of Domitian's eastern SC coinage records the title GERMANICVS) and AD 96."