[Answer] Hello, the bottom seal of the teapot is made in Wu Desheng.

【 Materials 】 During the Republic of China, Zisha Pottery Shop was founded by Wu in the fifth year of the Republic of China (19 16). The shop is located near Jiaoqiao in Yixing County. In the early days, it was printed as "Wu Desheng", Yang Wenshu Xiaozhang, and the bottom cover was also used. Later, it was printed as the great seal of Yang Wen, "Made in Wu Desheng". In the middle period, the books printed as Dayuan Zhang Yang were made in Wu Desheng and Wu Desheng in Yixing. By the end of 1920s, Wu, the shopkeeper, founded the famous "trademark" Jinding trademark. "Jinding Trademark" has a tripod printed in the middle and the words "Yang Wen Jinding Trademark" printed on the four corners, and it is specially printed for the store number of "Wu Desheng". In the later period, Wu also used the fine pot in Song Hexuan, a regular script. "Wu Desheng" and "Jinding Trademark" are printed on the bottom of the pot, and the lid of the pot is generally stamped by the small seal of the pot maker. At that time, Ru Yan, Chu Yinque, Wang Xichen and Feng Guilin. It was specially made for Wu Desheng, and Ren Ganting was specially made for Wu Desheng. Yu Guoliang, Cheng Shouzhen, Zhu Kexin, Wang Baogen, Wu Yungen and Wang Yinchun. Blank for regular orders. In the 14th year of the Republic of China (1925), Wu opened a semicolon in Shanghai, mainly selling purple sand products. Wu's own teapot also adopted a new model in the early days. After the outbreak of the Anti-Japanese War, "Wu Desheng" closed down, and the stamps of "Wu Desheng" and "Jinding Trademark" were used until the end of 1939.