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This is a nice ancient Roman silver Siliqua of emperor Valentinian, dating to 364 - 367 A.D. This This coin was minted at Lyon in France, mint mark LVG from a clogged die.
D N VALENTINIANVS P F AVG pearl diademed, draped & cuirassed bust right
RESTITVTOR REIPVBLICAE emperor standing right, holding Victory on globe & labarum.
This coin was minted at Lugdunum (Lyons in France) mint mark LVG. It had traveled across the English Channel, being discovered by a metal detectorist in Wiltshire.
DATE: 364 - 367 A.D.
MINTMARK: LVG (Lyon)
SIZE: 17.5mm dia
WEIGHT: 1.84 grams
ATTRIBUTION: RIC IX Lyons 6a; RSC 18-19+c.