Severus II (305-307 A.D.) -  AE Follis - 27mm, 9.62g
Obverse - FL VAL SEVERVS NOB CAES
Severus II, his laureate head right.
Reverse - GENIO POPV-LI ROMANI                              
Genius standing left, modius on head, naked but for
chlamys over left shoulder, holding patera (from which
liquor flows) in right and cornucopiae in left hand.
I in right field, ANT : in Exergue.

The image below was photographed by Numis Kimel.
I took the image above with a flatbet scanner.
And the image at the bottom, showing a close-up of the mint mark, with a digital usb microscope at 40x enlarged.
mint mark 40 times enlarged
Minted at the 10th officina (I) in Antioch (Antakya, Turkey) in 306 A.D during his reign as Caesar under Contantius I Chlorus.

Reference:
Sutherland, C.H.V., "Roman Imperial Coinage", Volume 6 (RIC), Antioch, p625, nr 75a.
Voetter, Otto, "Die Münzen der römischen Kaiser, Kaiserinnen und Caesaren von Diocletianus bis Romulus, Katalog der
hinterlassenen Sammlung und Aufzeichnung des Herrn Paul Gerin" (Voetter-Gerin), 1921, p41, #3.
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D."(Failmezger), nr 46aS.
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II),  p822, nr. 56 (B3, O2, R17, T11, M2, exe: I/ANT:)
Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-eBook),  p822, nr. 56 (B3, O2, R17, T11, M2, exe: I/ANT:)

General reference type (no detailed determination by mint mark or officina):
Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p282, nr 8., variety with Ol/2.
Kampmann, U., "Die Münzen der römischen Kaiserzeit", 2e Auflage (Kampmann), p438, nr. 146.59.

Quality: Very Fine+ with some pitting and encrustations.
Rarity: S (Scarce)