Marked Silver Plate. Set of 6. Estate sale find. I do not know maker or pattern. I did not clean. If I did I’d follow these steps: 1. Foil line a bucket with shiny side of foil facing up. 2. Put equal amounts of baking soda & salt on shiny foil. 3. Pour boiling water over item. 4. Let set. Some pieces take less than a minute...most a bit longer. 5. Rinse & buff with a soft cloth. (Make sure they are dry.) 6. Enjoy!