Which era does the authentic Wenbaozhai inkstone belong to?

Late Ming dynasty. Mo Bao Zhai inkstone was in the late Ming Dynasty, and inkstone, pen, ink and paper are the traditional Four Treasures of the Study in China and the necessary tools for China's calligraphy. Inkstone materials are also widely used, among which Hongsi inkstone in Qingzhou, Shandong Province, Duanyan in Zhaoqing, Guangdong Province, She Yan in Guzhou (now Huangshan Mountain) in Anhui Province and Taohe inkstone in Zhuoni, Gansu Province are the most prominent, and they are called "four famous inkstones".