Thanks @Romancollector , The coin is not fully silvered, but there are traces of silvering on both sides, more on the obverse. The surfaces are, however quite reflective. Here are a couple of IPhone images under my desk lamp.
That is indeed a spectacular portrait! I recently acquired a second reign follis, from the London mint under his son in law, Constantine I am content with my two examples of Maximian, although I could go for a better style portrait on both Pre-reform antoninianus First reign follis, Trier And his final appearance on coinage under Constantine, shortly after Constantine had lifted the damnatio against his father in law
My opening statement about this coin is mistaken. The QVIES type is explicitly a retirement type. Although there is no "S AVG" in the legend, it is believed this coin was probably struck after the Carnuntum conference in 308 when Maximian was again retired. It is usually best to do research before buying coins.
Nice coin, @Fugio. Congrats. RI MAXIMIANVS HERCVLIVS 286-305 CE antoninianus Antioch 292-295 CE Pre-Reform CONCORDIA MILITVM Jupiter RIC V 621 H-officina 8