Justinian I Follis

This is a second example of the early type side portrait Justinian the Great from Nikomedia. These are before the regnal year was added and the mint was abbreviated NIKM, not NIK or NIKO. Officina 'A' with a desert patina encrustation.
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You can read an extensive article on 'regnally-dated' Byzantine coins at our library, plus the Intro to Sear Byzantine coins
Byzantine Regnally-Dated Coins - Cervin: Byzantium Coins - Sear Intro
Byzantine Coins - Sear Intro: Byzantium Coins - Sear Intro
"Numismatist" (ANA) article on Justinian reform Folles at this: http://onlinedigitalpublishing.com/publication/frame.php?i=737638&p=&pn=&ver=html5