I look at this tea pot and I don't think Rosenthal, and yet it is. A very Modern, low tea pot has a band of cobalt blue swirls and dots around the body. The ;id id nearly the diameter of the pot. It seems Asian inspired in design. It's a very interesting piece. There's a tiny nick on the inside rim. I have other pieces in this pattern available in my shop.
Rosenthal Modernist Nordic - Swirls and dots Cobalt Blue Tea Pot - b169