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PROBUS - ROMAN EMPEROR: 276-282 A.D. -
Silvered Antoninianus (23 mm, 3.25 gm.)  Ticinum, 282 A.D.
Reference: RIC 526g.
VIRTVSPROBIAVG - Helmeted, radiate, cuirassed bust left, holding spear over  shoulder and shield. 
SECVRITPERP Exe: I/VIXXI - Securitas standing left, leaning on column and with  legs crossed, touching head.