It was during the Republic of China. Tiantan brand porcelain base is a trademark used by Jingdezhen porcelain shop during the Republic of China, so the porcelain fired from this base should be a product of the Republic of China. During the Republic of China, Jingdezhen porcelain manufacturers printed numbers on the bottom paragraph instead of their names. With the change of historical and political climate, the number of various styles is also different.