Tinned? copper-alloy buckle plate with textile remains

Tinned bronze buckle plate, length 2.8cm. Plate rectangular, shaped to bend over loop (iron and now broken away) and extended down back as back-plate. Two plates held together in middle by dome headed rivet; end of upper plate projects beyond lower and secured to it by two more rivets with bronze washers behind. A little textile remains at back, but too decayed for determination.