After a long break, I've been bitten by the ancients bug again, so I dug up a large lot of uncleaned coins I bought from
FORVM over 15 years, ago, and I've started cleaning/identifying them. This one, though, is beyond my meager talents.
Diameter is 20mm, and it weighs in at 5g. The
portrait appears to be female, with a bun, but I can't make out much in the way of letters beyond a clear N. The back appears to be some sort of standing figure, and I can make out a V just to the right of the
head.
Most of the coins I've identified so far have been Constantinian-era, if that helps the
identification. The pictures are taken on a 5x5mm grid, for reference.