
Pilch!
This is a coin depicting the Roman emperor Licinius II who ruled from 317-324AD. It was struck at the Cyzicus Mint between 317-320AD.
Reference in Roman Imperial Coins is RIC VII 11
Obverse: D N VAL LICIN LICINIVS NOB C,Laureated and draped bust left, with a globe and sceptre in left hand, and a mappa in right hand.
Reverse: IOVI CONSER_VATORI CAESS, Jupiter standing left, naked except for chlamys across left shoulder, holding Victory on globe in right hand, and left leaning on sceptre; eagle with wreath in beak at feet to left, a wreath in the left field with an "H" in the right field, SMK in exergue
This type of coin is fairly common and well worn, BUT your example shows a lovely and uniform patina with very nice surfaces.
Cheers,
-Kurt