Tupperware Rose 50s vintage Wm Rogers tray, silver plate over heavy copper

1950s vintage Tupperware Rose pattern silver plated tray marked Wm. Rogers, measures 13" in diameter across the rim of the tray.

We believe this is probably silver plate over copper or brass, sheffield plate style... it's a heavy piece. There's a little scratching to the finish, but no wear down to the base metal, just a little tarnish.