Picked this up at the Baltimore show for $22. Licinius bronze.
Obv: IMP LICINIUS PF AUG, Bust right
Rev: IOVI CONSERVATORI AUGG NN, Jupiter
TS (lambda) in exergue (is that Thesalonica and is that lambda? - can't remember and too lazy to look)

Ordinairly, I would have passed on this because I already have a Licinius / Jupiter (and several Constantine I / Jupiters) in my small collection. Those are in better shape as well. But this one has been clearly double struck.

If authentic, this is the oldest error I can remember seeing. Not so rare or valuable, but pretty interesting.

Neat! Too bad about the blue stuff, though.

The exergue to me looks like dot T S dot gamma dot

Agreed about the blue and it is there to stay but hopefully not get worse. Given the choice of better condition but undoubled, I had to go with the doubled.

TS should be Thessalonica with the rest denoting offinas I am thinking.

Cool, double strikes are kind of nifty. Thessalonica opened in 298AD so that seems quite likely to be the mint. To see some other ancient coin striking errors including a double strike see Doug Smiths