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This is an ancient Roman gold Solidus of emperor Honorius dating to 402 - 408 AD.
DN HONORI-VS PF AVG, "Our Lord Honorius, Dutiful and Wise Augustus" Pearl-diademed, draped and cuirassed bust right.
VICTORI-A AVGGG, "To the Victory of the Emperors" Honorius standing right, holding plain standard and Victory on globe, captive at foot. R.V. either side for Ravenna and COM OB in ex. *
*The moneta comitatensis was the imperial court mint that followed the emperor. A special mintmark COM for comitatus (or COMT.M) Most coins signed by the comitatensian mint also bear a supplementary abbreviation referring to the name of the town where the coin was actually struck in this case in Ravenna. The OB refers to pure gold - so it would read as "pure gold of the Imperial Court" (COMOB)
DATE: 402-408 A.D.
MINTMARK: RV (Ravenna, Italy)
SIZE: 20.73mm dia
WEIGHT: 4.5 grams
ATTRIBUTION: RIC X 1287, types a, c and d; Sear 20919.