I couldn't read the Chinese characters. But the clay does look like real yixing clay and the style/shape should be from the 1970's to 1980's. This should be made in China as yixing clay only exist in China and Taiwan only has mud clay.
Hi tonyt, most of your collections are made in 1980's to 1990's. Some are good for both decoration and tea making. But some are chemical color teapots that not safe to use. Especially,the teapots are in blue clour and green colour, and coasted with dark color. They are good for decoration only.
You have a very beautiful teapot that has excellent craftsmanship. The writing on the paper saying that Zhōu Cái Jūn makes this teapot. It is a certificate document. (However, please don't trust the paper too much, because anyone can write anything on a paper. In China, many non-yixing teapots come with this kind of certificate paper when people buy teapots.) If you have a picture showing you and the artist together with the teapot when you buy it, then it would be proof that this beautiful teapot is made by him.
By looking at this teapot from the picture, I believe it is really from the artist.
This beautiful teapot is good for decoration, but not good for tea making, because the artist added some color to the teapot to make it look more attractive. In China, this kind of teapot called 花货 Huā huò, is produced for decoration.
Below are the information of the artist and the related websites (in Chinese).
工艺美术师 Craft artists 江苏省陶瓷协会会员 Member of Ceramic Association of Jiangsu Province
Was born in 1968 in ceramics family; 1984 into Yixing mills, followed by senior industrial artist Liu Jianping Arts; 1987, following the Chinese artist Jiang Rong who is one of the most famous yixing teapot artist . In 1992 study at the Central Academy of Fine Arts training.