This is a 20mm
orichalcum Roman coin which I originally thought was a
provincial, until I saw the "S C" on the
reverse.
The
reverse appears to show a figure standing right holding an object - globe? in one hand. Traces of
legend are visible but not readable. The coin is much clearer "in hand" than in the photo, the
pitted surface makes it hard to photograph.
It's far too small for a 1st century as, but maybe a
bit large for a
semis, - could it be a late 2nd century as? The
obverse portrait looks like it could be
Severus Alexander.