I am wondering if this ancient Roman coin is real. I also don't know which officina it is. (1st(SMTSA), 2nd(SMTSB) or 4th(SMTSΔ) my head hurts from trying to see the officina, so...

It is a 1 follis Constantine the First, link in Numista:
https://en.numista.com/catalogue/pieces124413.html Some photos and measurements:

Not magnetic!




Thanks in advance guys!
