Meiji (1868-1912), Taisho (1912-1926), or Showa era (1926-1989), 20th centuryOne of akadamaishi, an impure chalcedony formed of quartz with inclusions of iron oxide imparting a red colour to the stone, the other of dark volcanic rock; each with a separate wood stand. 11cm x 34cm (4 3/8in x 13in) and 9.5cm x 15cm (3?in x 6in). (4).