Jovian

The coin is genuine, the celator gave the emperor a strong jaw. Nice coin.

Nice coin - I too think its genuine, the later coins are far less faked as they are not as profitable to the fakers.

You dont often see these later coins in such good condition and as well stamped - an excellent example.

I've found portraits in the Late Roman series to be generally unhelpful when it comes to identifying coins. Portrait style varied over time and from mint to mint, such that portraits of a single emperor can look more like portraits of other emperors than they resemble each other, and (with a few rare exceptions, like Julian II) there are no obvious facial features to make specific emperors distinctive. If I can't read the lettering or at least count how many letters there are, I've got no hope of IDing a coin just from the portrait.