Cru'dads analysis;
''Caught sight of this a while back and been trying to solve but rather difficult with condition.
Would be helpful to know sizes and weight plus what his friend’s find was too to perhaps narrow down date.
Any way after much fussing around and searching wildwinds for all possible Emperors (Jencek’s ID tool has closed too I have just discovered!). So had to use my own database fallback!
I believe the Bust right is late C1st to C2nd type and with possibility of being Radiate (therefore C3rd). There appears to be a DIVO start on obverse and Reverse is probably an Eagle Head right on a Globe but at a stretch could be an Emperor Seated left on a chair raising right hand (holding a sceptre)? Both those reverses are used on DIVO coins.
So all the following have DIVO coins which are Silver (Denarius or Antoninianus) : Hadrian, Commodus, Septimius Severus, Caracalla, Severus Alexander
The following DIVO coins are in Bronze (Antoninianus or Follis): Valerian II, Victorinus, Claudius II Gothicus, Carus, Numerian, Constantius I, Galerius and Romulus.
For reasons of having Radiate heads, Beards, bronze only or definitely not correct head style the closest example that nearly fits is Caracalla 218-219AD as below:
www.wildwinds.com/coins/ric/caracalla/t.html
If it were a Follis it could be a Maximianus bust but that has a Lion right reverse.
The head does appear to be like a laureate Hadrian but that does not really fit well as his DIVO types are all radiate.
So not having the coin in hand, measurements, weight, clear legend elements or Reverse that is the best that can be done for now to help.''