The first photo surely resembles
Hadrian, but that is a lot less clear on the other ones, especially the photo from a slight angle. The vast majority of these are later than
Hadrian - in fact, I can't recall seeing a lead seal of
Hadrian. I would be inclined to date this one later, at the turn of the 3rd to the 4th century. At this time a significant number of private individuals
had their
portrait on their personal
seals, and I assume this is one of them - the
portrait being bare headed. The name could be Greek ending in -OV.
Regards
Gert