I came Accross A Sheets Rockford 1875 Pattern 369 Made On Copper Serving Tray, I Can Not Find Anything About It Nowhere, How Old It Is, How Much It’s Worth, Thats Whats On The Bottem Of The Tray.Does Anybody Know About This Tray? Any Info Will Be Very Much Apperciated Thank You. I can Not Figure Out This Picture Thing, The Tray Is 13 Inchs And Got Some Weight To It For A Tray?? Please Help.