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Shibayama Masaya (柴山正弥) who live in Tokoname City, Aichi Prefecture - the place that famous for its unglazed ceramics and teapots for green tea. The bowl was made of fine clay and has some small pinholes on the body. Chawan is decorated with fine inscribed calligraphy. Such bowl will be a pearl in a connoisseur's collection. Chawan comes with original wooden box Tomobako and protective paper cloth. The potter's seal Masaya (正弥) is stamped in the bottom of the bowl, on the lid of the box and on the cloth.

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Some milestones in the pottery career of Shibayama-san: 1990 he was in charge of producing earthenware, trays, bottles, sake cups, etc. used for Daijosai (大嘗祭) - the third and last rite of passage of the new emperor to the throne and the coronation ceremony. 1994 certified by the Minister of Economy, Trade and Industry as a Tokoname ware traditional craftsman 1995 Aichi Governor's Award (excellent craftsman of traditional crafts) 1998-1999 Tokoname Yaki Cooperative Association Director

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Gyokuryu kiln runs by Umehara Jiro, son of potter Umehara Haruhito. Umehara-san was born in November 1952 and started to turn the potter's whell at around the fifth grade of elementary school. In 1967 he was graduated from Tokoname High School's ceramic industry and in 1975 he established Gyokuryuu kiln.

During his life, Umehara-san won many prizes and was awarded many times:
- Certified as a traditional craftsman
- Selected for the Japanese Sencha Crafts Exhibition
- Awarded Aichi prefecture excellent technology prize
- Award for promotion of the culture of Tokoname city
- Won Tokoname city "Nagaso Awards Ceramic Exhibition"
- Regional Brand "Tokoname-yaki" Certified Kiln and others.