CONSTANTINVS IVN NOB C, laureate, draped and cuirassed bust right / PROVIDENTIAE CAESS, Camp-gate with a door and two turrets, star above, SMNΓ in exergue. 20mm, 2.44 grams. Brown patina, Nicomedia mint, minted ca.328-329 AD, RIC 157.

Extremely rare, rated R5 in RIC (rarest rarity rank!)