Art S. Co. Silver Plated Tray

Gorgeous vintage Art S. Co. silver plated tray. Please see the last picture for the silver stamp. The stamp says “SPC,” which stands for silver plated copper. It is 11.75” long and 4.5” wide. I’ve polished it as best I can, but there is still a little tarnish in the corners. Perhaps you have fingers or a sponge smaller than my own and can address this yourself. 100% smoke-free home.