Justinian I (527-565) AR Follis (Bronze, 19.53g, 36mm) Constantinople. Dated RY 21 (547/8).
Obv: D N IVSTINIANVS P P AVG, Helmeted and cuirassed bust facing, holding globus cruciger and shield decorated with horseman motif; cross to right.
Rev: Large M; A/N/N/O - X/X/I across field, cross above, E below; CON.
Ref: Sear 163