Size: 28 mm, Weight: 15.61 grams This is an addendum to my last article re: the above and includes this photograph of what is clearly a sestertius of Septimius Severus, and with what is clearly an image of Pax on the reverse. Could this be: RIC 727 IMP VIII, PMTRPVCOSIIPP, RIC 739, IMPIIII, which would be inscribed PMTRPVCOS II PP? Or IMP X RIC 745? Or the unlisted IMPX PAX reverse without an inscription? Or a bizarrely manufactured phony - it sure looks like something was added to the surface of the coin. I have looked in every kind of light and can't make out an inscription on the reverse - BUT - it isn't easy to see anything on the obverse. I compared it with the two PAX type on ACSEARCH and not a match. Next are other databases. Next will be a rare As of Septimius with a platform scene - a photograph of this worn, but interesting coin was sent by a friend and it is worth seeing.
My best guess: probably TR P IIII or TR P V rev., requiring [IMP VIII or VIIII] on obverse. Rev. die is new to me, but the 5 TR P IIII-V dies in my catalogue all have S - C in rev. field, as on your coin. The two PACI AET P M TR P VI dies, in contrast, both have S C in exergue. Identifying the obv. die would likely settle the question, because I probably know other coins from the same obv. die and with legible IMP VIII, VIIII, or X. However I would need a plaster cast of the coin in order to identify the obv. die with certainty and ease.