Constantine I AE Follis. 313-317 AD. 

IMP C FL VAL CONSTANTINVS PF AVG, laureate head right.
IOVI CONS-ERVATORI, Jupiter standing left, chlamys across left shoulder, holding Victory on globe, leaning on eagle-tipped sceptre, eagle with wreath left.

N over Z in right field.
Mintmark SMN. 

RIC VII Nicomedia 14.

Contributed by Al Musgrove, May 2021.