Looks to me like three are some mold shifts and casting pearlage near "NVS" in HADRIANVS.
What stands out to me is the
reverse detail is crude for an engraving of that size and era, particularly the drapery details.
The
patina is fairly convincing though - better than most fake patinas you see. I wonder if the coin was left outdoors for a span of months to create the look?