Gold costume necklace with clasp in rectangle design 17 inches vintage

Gold (vintage) costume chain necklace in rectangle design 17 inches with clasp. Necklace is old but has not changed color. Tarnish resistant. Gold color is bold and even. There isn't any engraving on the necklace that I can see anywhere. Brand is unknown. Same looking necklace sold at Mason & Madison for $85.00 on line.