Any thoughts on what this Roman Republic Quadrigatus was struck over?

If I recall correctly an “overstruck” coin is a coin that has been re-struck over another coin but I can’t think of any Roman coins older than this one of the same weight and size so I’m just wondering if anyone has any ideas on what it could possibly be struck over?
Was it possibly struck over a foreign coin like a Greek didrachm?
Also where is the evidence of being struck over? I’ve looked at it under 5x magnification with a loupe but I can’t find any hint of another coin design on it.
Am I missing something?
Thanks everyone!
1
Comments
I would guess that it is assumed to be overstruck because this issue is always overstruck, rather than this particular coin being obviously overstruck.
It was around that time the Romans switched to overstriking coins plundered from Syracuse, Capua etc.
Hmm how come most of the slabbed quadrigati don’t say overstruck?
Is it just up to NGC whether they put it there or not?
From what I’ve read the silver used to strike these was silver paid to Rome by Carthage after the First Punic War and they minted these during the Second Punic War.
Eventually they were very debased so I imagine mine came from the beginning of the Second Punic War before Hannibal started scaring the heck out of the Romans.
Perhaps the marks around the eye and nose on the left - they look not unlike marks on others labelled overstruck of this type.
Thanks! I was wondering what happened there by the eye because it doesn’t look like “damage” in the sense of a drop or scratch.
I think you’re right