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This is a rare ancient Roman silver Miliarense of emperor Constantius II struck between 350 - 355 A.D.
D N CONSTANTIVS PF AVG - pearl-diademed, draped, cuirassed bust right
VIRTVS EXERCITVS soldier standing, head left, holding spear and shield.
It was struck at the Thessalonica Mint, bearing a TES Mintmark (for Thessaloniki in Greece)
This coin was found near Winchester in England, so it must have travelled throughout the Empire in trade or as a soldier's salary. It has been recorded by PAS as HAMP-488EBA, sadly damaged but still a rare coin, that was purchased directly from the finder.
DATE: 350 - 355 A.D.
MINTMARK: TES (Thessalonica, Greece)
SIZE: 22mm dia
WEIGHT: 4.29 grams
ATTRIBUTION: RIC VIII 160/203 / Sear 17884.