This is an antique stove heat exchanger/radiator, app. 13 3/4 inches tall and 10 1/2 inches in diameter at widest point. Unmarked. Bottom and top are cast iron, tubes are tin/metal. This was an add-on "radiator" which sat on top of a wood/coal stove and was supposed to radiate/distribute heat to the room. Don't know how well the design worked. Interesting primitive.