I've been doing a bit more research on this issue. My impression is that it's fairly common, and I've seen many online in a better state of preservation than mine.
The "ROMA" monogram on the obverse seems to me not unlike modern corporate logos. Also, what looks like a star at the bottom of the reverse apparently would've been recognized as a stylized "XVI" denoting the 16 asses that a denarius was then worth.
Colligo ergo sum





















