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This is an ancient Roman gold solidus of emperor Valentinian III dating to circa 441 - 450 AD
Obverse: DN VALENTIN-IANVS P F AVG, "Our Lord Valentinianus, Pious and Blessed August" Pearl-diademed, helmeted, cuirassed bust three-quarter facing, spear in right hand over shoulder, shield with horseman in left
Reverse: IMP . XXXXII . COS-XVII . P . P . Constantinopolis enthroned left, globus cruciger in right hand, sceptre in left, left foot on prow, shield at right.
This is a superb example in about EF condition with plenty of mint lustre. This coin was struck at Constantinople between 441 - 450 AD right in the middle of the Roman conflict with Atilla the Hun!
DATE: 425 - 455 AD (this coin minted between 441 - 450 AD)
MINTMARK: COMOB (Constantinople)
SIZE: 21mm diameter
WEIGHT: 4.43 grams
ATTRIBUTION: RIC X, 302 (R4) (Theodosius II)
PROVENANCE: Formerly in a private collection in Picardie, France