| 1870 | Founded by Shinsuke Matsubara (Kosen I) in Kaga Hachiman, Komatsu City, Ishikawa Prefecture. |
| 1885 | Received the Silver Cup and the Merit Award from the Ministry of Agriculture and Commerce |
| 1920 | Relocated and built a new kiln in Nomachi, Kanazawa City (Kosen II) |
| 1923 | Presented an incense burner to the Emperor Regent (Showa Emperor) on the occasion of his visit |
| 1926 | Awarded the Grand Prize at the World Exposition in commemoration of the 150th anniversary of American independence |
| 1930 | Awarded the Grand Prize at the World Exposition in Liege, Belgium |
| 1935 | Succession to the name of Kosen III |
| 1948 | Recognized as an artist designated for the preservation of ceramic techniques |
| 1958 | Produced for the Emperor and Empress on the occasion of their visit (presented a bowl of powdered green tea) |
| 1963 | Selected for the Ninth Japan Traditional Crafts Exhibition, and successive selections thereafter |
| 1965 | Full member of Japan Craft Association |
| 1966 | Produced a bowl for the visit of Their Imperial Highnesses Prince Masahito and Princess Hanako of Hitachiomiya (offering a bowl of powdered green tea) |
| 1967 | Received the highest award at the 13th Japan Traditional Crafts Exhibition |
| 1968 | Produced a bowl for the visit of His Imperial Highness the Crown Prince |
| 1975 | Produced a bowl for the visit of His Imperial Highness Prince Tokujin Hirohito (offered as a matcha bowl) |
| 1988 | Succession to the name of Kosen IV |
| 1990 | Held an exhibition to commemorate the 120th anniversary of the opening of the kiln |
| 1995 | Judge of the 17th Japan New Craft Exhibition |
| 1996 | Became a friend of Nitten |
| 2006 | Prime Minister Koizumi visited the kiln on the occasion of "Japan's Craftsmanship" sponsored by the Agency for Cultural Affairs |
