This is a beautiful-condition original antique Japanese tetsubin cast iron teapot with hobnail type bumps on the upper section of the cast iron. It has a copper lid with a beautiful patina and black lacquered paint on the underside.
The knob is also copper with a beautiful flower design. The handle I believe is brass or copper. On the one side of the teapot, if you look closely, you can see that there were probably 4 kanji characters that are almost impossible to read due to age (please see second to last photo).
This was most likely the signature of the maker. This teapot has probably been heated and oxidized for a very long time. It measures approximately 5.75" tall (to the top of the knob) with an opening diameter of 6.5".
To the top of the handle, it is 8.75 tall. A very old teapot with a very sought-after design that I'm sure is at the newest Meiji period but it could be quite a bit older. Please ask if you have any questions. Collectibles memorabilia antique retro vintage history historic tea ceremony kitchen accessories making teas matcha green tea oolong sencha nihon nippon tradition traditional steel metal chagama chigama japan japanese asia asian.