Though worn, this is a fairly rare type recently offered on Vcoins.
It was issued by Maximinus II during the Great Persecution of Christians. The mintmark OPA is unique and scholars do not know the meaning or significance.
Maximinus II
A.D. 310- 312
15mm 1.4gm
DEAE SANC CERERI, Veiled and diademed bust of Ceres left, holding corn ears in her hand.
GEN CIVIT NICOM, Fortuna with rudder and cornucopia.
In exergue OPA
Van Heesch 1, Vagi 2958