this coin, which has a workshop not listed in RIC, just sold for $375.
Maximinus II. As Caesar, AD 305-309. Æ Follis (27mm, 5.79 g, 6h). Cyzicus mint, 4th officina. Late AD 308. Laureate head right / Camp gate with four turrets, no doors; MKΔ. RIC VI 40 var. (officina Γ). RIC VI 40 var. (officina). Dark green patina, slight roughness on obverse. Good VF. Rare. CNG 460, Lot 788