C.375-450 AD, the period of the fall of the Empire under invasion by the Barbarians. See https://www.forumancientcoins.com/numiswiki/view.asp?key=Military%20Belts image 7 top left for an identical example identified as Sommer type 1.A.B. Just under 2” length with sheet plate and D shaped buckle. The plate with engraved line border to the front and embossed geometric triangle motif to the back. Roman legionaries wore two belts, crossed, suspending, respectively, the sword and dagger. Museum quality and condition.