vintage cast iron tetsubin teapot, flat saucer shaped tea kettle w/ bamboo design

Unmarked vintage cast iron tetsubin with bamboo design, traditional saucer shape. This is about 6 3/4" in diameter.

I'm not sure of the exact vintage here - this has been used and shows a little age, but I don't believe it's antique. It's solid, no cracks or chips - but it does need cleaning inside and out.