Justinian I (527-565) AE Follis (Bronze, 17.53g, 33mm) Nicomedia, 2nd officina, Dated RY 30 (556/7).
Obv: Diademed, helmeted, and cuirassed facing bust, holding globus cruciger and shield; cross to right
Rev: Large M; cross above; A/N/N/O X/X/X across fields; B//NIKO.
Ref: DOC 136b; Sear 201.