I don't know if it's authentic or not, but it has the same design as this: https://www.ebay.com/itm/194948204479
RIC 125A of Septimius Severus: https://numismatics.org/ocre/id/ric.4.ss.125A_denarius It is the same type as in the eBay listing, though they mis-identified it as RIC 504 (which is COS III). ATB, Aidan.
Since this thread was directed to me. I already have a similar denarius with Septimius Severus. Thanks though, one is enough for my little set.