Copper-alloy buckle and plate

Bronze buckle, length 2.6cm. Oval loop with straight bar, decorated with 4 groups of three transverse grooves. Tongue grooved at front and back, bent into hook at back around bar. Plate of doubled sheet metal, cut for tongue, and secured at bottom by 2 round-headed rivets, 2 cut out triangular openings to show leather belt. Surface of plate very smooth golden brown, as if gilded(?) with impure gilding.Possibly not from grave 74, as the size seems to be incorrect