Julia Domna Denarius. IVLIA AVGVSTA, draped bust right / IVNO REGINA, Juno standing left with patera & scepter, Peacock at foot to left. RIC 560, RSC 97.
That's what it appears to be, though keep in mind that this means that it's still an ancient coin, just not one any governing authority put out. What counterfeiters would do in those days is make fakes of silver coins by making a bronze coin with a silver coating, since the total price of the metals would be worth less than the face value of a denarius. This was done so much that such counterfeits are extremely common today.
Commonly seen contemporary counterfeits often combine obverses of one ruler with reverses of another but no one combined the image of Juno with her peacock and the Pietas Publica legend. That means the reverse die was created rather than copied. This is less common but know but my experience with such things includes coins that are not plated but struck in degraded silver alloy. The item is still a fake but perhaps a higher grade of fake. It is not official. There is a collector who specializes in these and has quite a list on his site: http://www.coinsforever.com/ He has several Domna coins but I did not see a match to this coin. Click on his link to see his coins or write him asking if he has seen the type.
