SCHWESTER思韦斯特钢琴由SCHWESTER PIANO思韦斯特钢琴股份公司生产的品牌。

 SCHWESTER, Kitakojuya Ohtaku,Tokyo, Japan owned by Yasuo Matsugaki.
    Numbers are not serial numbers, but number of pianos made in that year
        1929 to 1956-5000      1956 to 1960-3500

       1961-900       1965-1000      1969-1100     1973-1800
       1962-1000     1966-1050      1970-1050     1974-1850
       1963-1000     1967-1100      1971-1650     1975-1870
       1964-1000     1968-1000      1972-1700     1976-1950
SCHWESTER, PIANO CO., 2482 Kitakojiya, Ota-Ku, Tokyo, Japan Est. 1929
       1956-315000   1958-330000   1959-340000   1960-350000