The gamma
officina of
Siscia produced some fairly ornate
bust types. The
reverse looks completely official, yet the
obverse nags just a little
bit. But I see nothing wrong with the coin, even if it were a
contemporary counterfeit as
Robert suggests. You might want to send a PM to leetoone and invite him to weigh in on your coin. I believe he collected this series quite extensively for many years. He would be one of the resident experts on this specific issue.
Here's my example, from a batch of uncleaned coins, purchased in 2000. - Jon