Theodosius Miliarense

It's a beauty, congrats.

Bringing genuine ancient coins out of Bulgaria is a risky business under both Bulgarian law and United States law. Numismatic fakery, on the other hand, is something of a national industry in Bulgaria.

(Edit: Perhaps I ought to learn to read the OP a bit better before responding...but I enjoy a good combing over style)

I share the other's suspicions about its authenticity. These silvers are one of the finest issues left in the late empire; with a good strike and no wear, like this example, it should be of the quality seen with other examples. Compare, especially, the lettering, to authentic ones, as this is usually the first place a struck fake can be spotted:




Also take a look at the drapery on those; the drapes are contoured to a raised bust, but this has a flat bust, reminiscent of the early byzantine coins.

The reverse, too, looks like modern work to me. Have a look at the how the halo relates to the head on yours against this one, and the ones above:



The die sinker here hasn't rendered any facial features and you should be able to see the back of the diadem hanging behind the head, but it is absent. The cuirass isn't rendered with any care, but the authentic issues put a lot of work into it. On top of that, the reverse figure on yours is quite well proportioned, but the ones I have seen have quite a squat profile with an enlarged head. A final point; the star in the left field is always 8 pointed, formed by 4 cuts into the die, but yours has a 7 pointed star.

I would put this one in the 'Black Cabinet' as a cautionary tale; the Bulgarians are prolific forgers of ancient coinage.

My first and last coin I ever bought from Bulgaria was a fake Hadrian. Luckily, I bought on ebay and I got a full refund. I don't buy from any eastern European countries as a whole. I realize that I'm stereotyping, but I'm still a novice at spotting fakes. In any case, they sure are the best in creating them.