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An oki-koro wth the original ash pot by Suwa Sozan I enclosed in the original wooden box titled Fuji Koro annotated Sozan-sei and dated the eigth month of 1922. The bottom of the basin and the inside of the mountain both bear the artists oval seal. It is 11-1/2 x 7 x 5-1/2 inches (29 x 18 x 14 cm) and is in fine condition. A similar work with a base annotated by Tomioka Tessai is visible in the catalog Suwa Sozan Sakuhin Shu (1971).
Sozan I (1852-1922) was born in Kutani country, present day Ishikawa prefecture, where he initially studied before moving to Tokyo in 1875. Over the next 25 years he would gravitate between Tokyo and Kanazawa, working at various kilns and research facilities. He again relocated, this time to Kyoto in 1900 to manage the Kinkozan Studio before establishing his own. His name became synonymous with celadon and refined porcelain and was one of only five potters to be named Teishitsu Gigei-in. The Teishitsu Gigei-in were members of the Imperial Art Academy, Perhaps in modern terms one might call them the predecessors to the Living National Treasures. However unlike the LNT, there were only five Pottery artists ever named Teishitsu Gigei-in, Ito Tozan, Suwa Sozan, Itaya Hazan, Miyagawa Kozan, and Seifu Yohei III. He was succeeded by his adopted daughter upon his death. He is held in the Kyoto National Museum among many others.