It actually looks pretty close to this coin, which is from the Roman empire 100 AD http://www.oceanlight.com/stock-photo/roman-emperor-agrippa-photograph-06527-137724.jpg
It's real. Adrienna has the right reverse, but I'd expect from the size of this one that it comes from the time of Constantine and his followers in the 330 AD era. I love that these ancient coins are showing up on Listia!