Kohler and Campbell 鋼琴的年齡:

出廠年- 序號

1900 - 10000
1905 - 46000
1912 - 164000
1913 - 150000
1915 - 165000
1916 - 179000
1917 - 190000
1918 - 198000
1920 - 206000
1921 - 210000
1923 - 223000
1924 - 237000
1925 - 237000
1926 - 240000
1928 - 258000
1929 - 264000
1931 - 267000
1932 - 268000
1933 - 270000
1934 - 272000
1936 - 276000
1937 - 278000
1948 - 403000
1949 - 406000

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直立式鋼琴與三角鋼琴,1950 年 - 1983 年:

1950 - 408000
1955 - 503000
1958 - 521000
1960 - 535000
1961 - 542000
1962 - 551000
1963 - 560000
1964 - 570000
1965 - 579000
1966 - 589000
1967 - 601500
1968 - 611000
1969 - 621000
1970 - 631500
1971 - 643000
1972 - 653500
1973 - 660000
1974 - 683000
1975 - 695000
1976 - 708500
1977 - 712000
1978 - 722500
1979 - 737000
1980 - 754000
1981 - 767000
1982 - 780000
1983 - 795491