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This is an ancient Roman gold Solidus of emperor Valens, dating to 364 - 378 A.D.
DN VALENS PER F AVG, pearl-diademed, draped and cuirassed bust right
RESTITVTOR REIPVBLICAE, emperor in military attire, standing facing, head right, holding labarum (cross on banner) and Victory on globe. Chi-rho in left field.
This coin was struck at the Antioch mint, in 367 A.D. mint mark ANTI Γ [Gamma (3) for the 3rd Officina at Antioch] This coin has seen circulation and exhibits consistent wear and a few graffiti scratches. A good example that had been graded as 'a pleasing VF' by Baldwins.
DATE: 367 A.D.
MINTMARK: ANT Γ (Antioch, Turkey)
SIZE: 20.98mm dia
WEIGHT: 4.32 grams
ATTRIBUTION: RIC IX Antioch 2d, type xxviii; cf. Sear 4104.
PROVENANCE: Ex. Baldwins of St. James, London.