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This is a superb ancient Roman silver Siliqua of emperor Constantius II struck between 337 - 361 AD
D N CONSTANTIVS PF AVG - Diademed bust of emperor facing right
VOTIS XXX MVLTIS XXXX in four lines within wreath. (dot) SIRM (dot) in exergue.
Extremely Fine, attractive toning. Unclipped and in mint state - appears to be from a hoard.
DATE: 355 - 361 A.D.
MINTMARK: SIRM (Mint of Sirmium, in Serbia)
SIZE: 22mm dia
WEIGHT: 3.14 grams
ATTRIBUTION: RIC VIII 66