Thanks for the thought Finn, I have owned several of those types you mentioned and it isn't from the Constantine era, I am pretty sure of that.
The Obverse bust is of a more " greek " type, the closest I can find is from Mysia.

Not the same type but the bust is very similar.
The Obverse bust is of a more " greek " type, the closest I can find is from Mysia.

Not the same type but the bust is very similar.

























