Maximinus II, as Caesar (305-309) AE Follis, issued 308-9. Nicomedia, 7.20g, 25 mm.
Obv: GAL VAL MAXIMINVS NOB CAES; Laureate head of Maximinus II to right. 
Rev: GENIO CA-ESARIS CMH (mark of value); Genius, nude but for chlamys, standing front, head to left, wearing kalathos and holding patera from which liquor flows in his right hand and cornucopiae in his left; SMNB in ex.
RIC 55.
From the Shea19 collection, Ex. Leu Numismatik, Web Auction 11, lot 1972, 22.02.2020.
A superior example, with excellent detail.