Okamoto Kazuo was born in 1930 and looking at the
box it would appear that this chawan was made during the 1970s. Okamoto
worked or still works in Kyoto and this inlaying style of
decoration is known as “mishima”. Here the carved patterns are filled with a
different coloured slip that is scraped from the regular higher surface when
hard so making it a time consuming way of decorating. Besides the usual
information on the outside of the lid there is also calligraphy on the inside
as well that can be seen in image 4 above.