I'm not sure I understand your question completely, but I'll explain.
The
mintmark on your
coin shows S crescent and an unknown letter. It should be S crescent A. The first letter is the
officina number, the crescent and A indicate it's from
Arelate. This series was struck at four
officinae; P,S,T and Q, which all should appear before the crecent A. This coin of Licinius, however, was only struck at the second workshop (
officina) which is S. So, the only option for your
mintmark is S crescent A.
I
hope that is more clear,
Tom