I'm often capable of figuring out what these specifically are, but this one due to its advanced state of wear is a bit beyond my abilities. My impression from its style is that it's not a late coin. The emperor looks to be young. I can read "Caesar" at the end of the obverse legend. The reverse appears to depict Roma holding Victory. I imagine somebody will recognize it.
23 mm in diameter, weight is 8.24 grams.

