This is a beautiful Sunbeam stacking coffee pot. It was introduced at the 1939 Worlds Fair. The top pot brews the coffee and the bottom part is for serving it up. The water is placed in the bottom pot and the grounds are put into the top pot. As the water is heated it causes a vacuum to be created. The vacuum draws the water into the top pot. As it cools the water in the top pot trickles down through the coffee grounds back to the bottom pot. I guess this would be considered to be an early predecessor to the drip coffee pot. It has a few bumps and bruises as is to be expected but the chrome and bakelite are actually in very good shape. We have plugged it in and it does heat up. It comes complete with the filter assembly and cord so it's ready to brew or display. The metal plate on the bottom is not readable so we can't determine which version of C-20 this pot might be.