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This is a nice ancient Roman silver Siliqua of emperor Valens, dating to 367 - 375 A.D.
DN VALENS PF AVG pearl-diademed draped and cuirassed bust facing right
VOT X MVL XX in wreath, mintmark ANT. Dot in the badge at the top of the wreath
This coin was minted at Antioch (Antakiyah, Turkey), mintmark ANT It had travelled to the edge of the empire being discovered by a metal detectorist in Thetford, UK.
DATE: 367 - 375 A.D.
MINTMARK: ANTI dot (Antioch, Turkey)
SIZE: 17.50mm diameter
WEIGHT: 1.37 grams
ATTRIBUTION: RIC IX Antioch 33b.