It could be.
It could also be the first known depiction of an extraterrestrial, too.
Anything is possible.
It could represent a Roman convert’s idea of Christ. The Romans had no compunctions against the portrayals of deities like the Jews, and hence the early Christians, did. That would account for the similarity between the coins and statues of the day and the plates............
“It could also be the first known depiction of an extraterrestrial, too.”
Yeah, waiting for the Chariots of the Gods folks and History Channel/NatGeo to jump on this one - looks like a space helmet on whomever it was.