Probably an ancient copy from dies in official style
, probably mechanically derived from genuine coins.
is actually of Elagabalus
in 219 or Severus Alexander
in 231, and it seems highly unlikely that the mint still had
die of Caracalla
on hand and mistakenly brought it back into use two years or fourteen years after that emperor's death!RIC
378 of Septimius is Eastern, but the reverse
of your coin is clearly in Roman style
Unfortunately the true explanation is simpler: both dies are by Lipanoff
, the obv. no. 81 in Prokopov
's book, the rev. no. 104 (Severus Alexander
)! I hope
you can return it.