antique early electric vintage, architectural salvage solid brass receptacle flip cover floor plate

Old early Harvey Hubbell vintage, solid brass, flip cover architectural floor plate for a single electric socket receptacle. This measures 4 1/2" long, 2 3/4" wide with beveled edges. The center hole for the receptacle face measures 1 1/2" across. This has a patina of age. It is not marked that we can find.