This is an authentic cast-iron Japanese Kama and Furo set used for tea ceremony from mid. 1900's.
Kama is used to heat the water used to make tea. In the tea room, the kama is either heated over a portable brazier, Furo or in a sunken hearth, Ro built into the floor of the tea room, depending on the season. Furo is the one below to boil water.