I've had this coin for a while and I'm not quite sure what to make of it, the obverse appears to be Commodus similar bus to this Coin : http://www.wildwinds.com/coins/sear5/s5705.t.html And the Reverse seems to be from an issue of Antoninus pius, Similar to: https://www.artemideaste.com/auction/view/230/251 There is also something weird going on with felictas arm. Its been suggested to me that it could potentially be an ancient forgery, a mule from two dies ~30 years apart, but I'm not sure about all that.
Thats a young portrait of Commodus around 180 AD on the obverse , and one would expect a second consulship (COS II) on the reverse side. a COS IIII as shown on your coin would have an older portrait of Commodus, on the obverse, something like this one :
I have a Commodus mule too, Its plated Obverse: Commodus dated 183-84 AD and Reverse: RiC 206 Marcus Aurelius reverse168-169 AD
That's an interesting OP 'mystery'. And a cool mule post by @arnoldoe I'm with @Pishpash ....I LOVE a puzzle and I'd lean toward a possible plated mule. I hope someone can definitively nail this down....like @dougsmit ????
Without flaking or an obvious break to reveal the core base metal beneath, or chemical analysis I believe it is impossible to tell....and I would not recommend the more invasive alternatives. Perhaps it's just the photos but the OP seems to suggest a plated coin.
A short while ago I showed several unofficial but solid denarii of this period so there is no reason to believe the coin must be plated. Unofficial solid coins are not rare from Pius through the Severans. Some are very close to correct style. Some not. None of these are plated. Pius x2 Faustina I Commodus
