For a similar Chinese Yuan dynasty Yun Yao bowl, decorated with the same glazes see Christie's London, Fine Chinese Ceramics, 16th June 1986, Lot 121.
Hamada Shoji went to work at the Kyoto Municipal Ceramic Laboratory after graduating from the ceramics department of the Tokyo Advanced Technical College in 1916. Together with Bernard Leach, he went to live in St Ives in 1920 and he said that in the intervening years he made 10,000 experiments with Chinese-style glazes. These small pedestal-bowls were evidently a continuation of Hamada's experimental work in Japan, before settling down to the new forms and glazes he discovered in Cornwall. Several are known, one being in the collection of Tsuji Kinichiro and illustrated in the catalogue The English Arts and Crafts Movement and Hamada Shoji, (Japan, 1997-8); another, with an all-over blue glaze, was sold at Christie's, South Kensignton, 2nd July 1997, Lot 37.