This coin has some nice detail on the reverse, it looks like it might be a person in the aft cabin-- at least a dot that might be a head, and an interesting portrait of Constantine.
Constantine I
A.D. 327
19mm 3.0gm
CONSTANTINVS MAX AVG; laureate head right.
LIBERTAS PVBLICA; Victory standing left on galley, wreath in both hands, B in left.
In ex. CONS
RIC VII Constantinople 18