Q: I’ve had this unusual teapot for about 20 years. It’s unmarked except for the words “Made in China,” which are stamped on the bottom. It’s about 7 inches tall. Does it have any value?

A: Several versions of this blue and white “donut” teapot have been made and they all seem to have been made in China before 1800. Some of them have unidentified makers marks. Hall China of East Liverpool, Ohio, began making a donut-shaped teapot in 1938. It is one of the company’s most popular shapes. Hall teapots are glazed in solid colors. Your 20th-century Chinese teapot sells for $8 to $15 online.