Reverse:Emperor advancing right, labarum with Chi-Rho on banner in left hand, dragging captive with right
SISCIA mint. The mint at Siscia was first opened by Gallienus in AD 262 and was operational until AD 383 (plus or minus a year or two).
Don.....
A tighter date range of your coin is between about 317 and 383. The 317 date is used as the first year in which the Chi-Rho sign appeared--as on your coin--during the reign of Contantine I. That will narrow your area of search.
Don....
Sorry can't make out what the lettering is coin bad condition . It looks copper has got green tarnish on it .was found while I was taking out a gravel driveway .was a lucky eyeball find
Yes, there is lettering above the bust; that is why I didn't attribute the coin to a particular ruler in my two posts above--only to a date range.
The exact coin has yet to be posted.
Don.....