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Crystallized feldspar bursts out from the terracotta sides of this early mentori vase by Koyama Yasuhisa enclosed in the original signed wooden box. It is stamped on the base Koyama and measures 7 inches (17.5 cm) tall, 5 inches (12.5 cm) diameter and is in fine condition. The box lid is dated inside Showa 44 (1969), the same year Koyama Yasuhisa opened the first half submerged Anagama kiln in Shigaraki. Born in Shigaraki, Yasuhisa began at the prefectural industrial research facility before taking up an apprenticeship under Hineno Sakuzo. As mentioned above he developed the first half submerged (Hanchijoshiki, perhaps better half exposed) kiln in Shigarai in 1969 and spent his time researching natural glazes. Subsequently he developed a great many kilns in and around the Shigaraki valley.