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:
Thanks in advance guys!