A new Aureus which came in a group lot of "plated" coins doesn't appear to be plated, with no core showing even with a deep scrape on the top right of the obverse.. however I think it is probably a little bit debased.. ..From what I found I think the type only exists as an Aureus of Caracalla + mine weighs 6.1 grams vs 7.2 grams on average for a genuine Aureus So my guess would be an ancient forgery of a Caracalla Aureus, made by pouring gold into a mold made from a genuine(but holed) Caracalla Aureus then breaking it out? same type (not mine)
It would appear that the holed original from which the cast piece was derived shared both of its dies with the EF original that you also illustrate.