Maximinus II - engraver's error Quarter Follis! (F2201)

This coins says Maximinus II as Augustus, but in 305-306 AD he was Caesar. NOT IN RIC! 305-306. 1/4 Follis (Bronze, 17.5 mm, 2.06 g), Siscia, 305-306. GAL VAL MAXIMINVS PF AVG Laureate head of Maximinus II to right. Rev. GENIO POPVLI ROMANI // SIS The Genius of the Roman people, nude but for chlamys, standing front, head to left, wearing kalathos and holding patera in his right hand and cornucopiae in his left. RIC -.- very rare!