Justinian I, AE follis, Rome mint, AD 527-565.

DN IVSTINIANVS PP AV, helmeted, cuirassed bust facing,
holding cross on globe and shield.
Large M, RO-MA downwards to left and right, cross above,
INVIC beneath dotted line below.

Fagerlie in ANS MN 12, plate XXVII, 2 (ANS collection); SB 
300 var (has star above), MIB 220 (ditto).