The following list of numbers represents the date of manufacture followed by the piano serial numbers. The letters ‘sn’ mean serial number.
Piano Manufacturer: Apollo
1901 sn-2075 1911 sn-17800 1921 sn-45000 1931 sn-112000
1902 sn-4000 1912 sn-19600 1922 sn-49000 1932 sn-118000
1904 sn-7000 1914 sn-23200 1924 sn-58000 1934 sn-130000
1905 sn-8700 1915 sn-24400 1925 sn-63000 1935 sn-132000
1906 sn-10000 1916 sn-26800 1926 sn-77000 1936 sn-135000
1907 sn-11500 1917 sn-29000 1927 sn-80000 1937 sn-137000
1908 sn-13000 1918 sn-32800 1928 sn-87000 1938 sn-150000
1909 sn-14500 1919 sn-36000 1929 sn-95000 1939 sn-155000
1910 sn-16000 1920 sn-40000 1930 sn-106000
Piano Manufacturer: Aria Divina
1920 sn-147500 1923 sn-170000 1926 sn-202000 1929 sn-226000
1921 sn-155000 1924 sn-180000 1927 sn-210000 1930 sn-230000
1922 sn-162500 1925 sn-190000 1928 sn-218000
Piano Manufacturer: Armstrong
1900 sn-43000 1909 sn-62000 1918 sn-79000 1927 sn-89600
1901 sn-45000 1910 sn-63700 1919 sn-80200 1928 sn-91500
1902 sn-47000 1911 sn-65500 1920 sn-81100 1929 sn-93700
1903 sn-49000 1912 sn-67800 1921 sn-82900 1930 sn-94000
1904 sn-51000 1913 sn-71000 1922 sn-83900 1931 sn-94100
1905 sn-53000 1914 sn-73600 1923 sn-84900 1932 sn-94300
1906 sn-55400 1915 sn-74000 1924 sn-86600 1933 sn-94400
1907 sn-57600 1916 sn-75600 1925 sn-87800 1934 sn-95800
1908 sn-59900 1917 sn-78000 1926 sn-88700 1935 sn-96000
Upright and grand pianos built by Aeolian after 1959:
1960 sn-364200 1966 sn-397700 1972 sn-420500 1978 sn-440000
1961 sn-370700 1967 sn-401500 1973 sn-424900 1979 sn-444000
1962 sn-376900 1968 sn-405200 1974 sn-430300 1980 sn-446900
1963 sn-383100 1969 sn-407500 1975 sn-433400 1981 sn-449700
1964 sn-387900 1970 sn-410900 1976 sn-436900 1982 sn-452400
1965 sn-392000 1971 sn-415600 1977 sn-438000
Piano Manufacturer: Astin – Weight
1959 sn-1000 1968 sn-10000 1977 sn-19000 1987 sn-29000
1960 sn-2000 1969 sn-11000 1978 sn-20000 1988 sn-30000
1961 sn-3000 1970 sn-12000 1979 sn-21000 1989 sn-31000
1962 sn-4000 1971 sn-13000 1980 sn-22000 1990 sn-32000
1963 sn-5000 1972 sn-14000 1981 sn-23000 1991 sn-33000
1964 sn-6000 1973 sn-15000 1982 sn-24000 1992 sn-34000
1965 sn-7000 1974 sn-16000 1983 sn-25000 1993 sn-35000
1966 sn-8000 1975 sn-17000 1984 sn-26000 1994 sn-36000
1967 sn-9000 1976 sn-18000 1985 sn-27000 1995 sn-37000
Piano Manufacturer: August Forster
1873 sn- 900 1924 sn- 50000 1960 sn-122500 1974 sn-147500
1880 sn- 1700 1929 sn- 60000 1961 sn-124000 1976 sn-150000
1886 sn- 5000 1937 sn- 73000 1966 sn-134000 1978 sn-152000
1898 sn-10000 1948 sn- 85000 1968 sn-137500 1980 sn-154000
1904 sn-15000 1950 sn- 86300 1970 sn-140500 1990 sn-161000
1910 sn-25000 1952 sn-102000 1972 sn-143500 1996 sn-164200
Piano Manufacturer: Autotone Player Pianos
1960 sn-121100 1966 sn-134300 1972 sn-142900 1978 sn-150900
1961 sn-123400 1967 sn-136000 1973 sn-144700 1979 sn-150300
1962 sn-126200 1968 sn- N/A 1974 sn-146500 1980 sn-151100
1963 sn-128500 1969 sn- N/A 1975 sn-147600 1981 sn-151800
1964 sn-130500 1970 sn- N/A 1976 sn-148700 1982 sn-152200
1965 sn-132000 1971 sn-141100 1977 sn-149900 1983 sn-153100
Piano Manufacturer: Bacon, Francis
1950 sn-408000 1964 sn-570000 1971 sn-643000 1978 sn-722500
1955 sn-503000 1965 sn-579000 1972 sn-653500 1979 sn-737000
1958 sn-521000 1966 sn-589000 1973 sn-660000 1980 sn-754000
1960 sn-535000 1967 sn-601500 1974 sn-683000 1981 sn-767000
1961 sn-542000 1968 sn-611000 1975 sn-695000 1982 sn-780000
1962 sn-551000 1969 sn-621000 1976 sn-708500 1983 sn-795491
Piano Manufacturer: Bailey
1901 sn-1000 1909 sn-9000 1916 sn-16000 1923 sn-23000
1902 sn-2000 1910 sn-1000 1917 sn-17000 1924 sn-24000
1903 sn-3000 1911 sn-11000 1918 sn-18000 1925 sn-25000
1904 sn-4000 1912 sn-12000 1919 sn-19000 1926 sn-26000
1905 sn-5000 1913 sn-13000 1920 sn-20000 1927 sn-27000
1906 sn-6000 1914 sn-14000 1921 sn-21000 1928 sn-28000
1907 sn-7000 1915 sn-15000 1922 sn-22000 1929 sn-29000
Piano Manufacturer: Baldwin
1900 sn-10400 1962 sn-152706 1974 sn-204113 1986 sn-266329
1910 sn-16400 1963 sn-156591 1975 sn-208742 1987 sn-270416
1920 sn-35800 1964 sn-160868 1976 sn-213470 1988 sn-278556
1930 sn-63000 1965 sn-165701 1977 sn-217853 1989 sn-284228
1940 sn-88700 1967 sn-175821 1979 sn-228858 1991 sn-293772
1943 sn-102000 1968 sn-179702 1980 sn-236654 1992 sn-301774
1948 sn-105000 1969 sn-184661 1981 sn-242984 1993 sn-305110
1950 sn-110243 1970 sn-190028 1982 sn-248306 1994 sn-310000
1955 sn-128167 1971 sn-192401 1983 sn-253274 1995 sn-313000
1960 sn-145002 1972 sn-195485 1984 sn-257293 1996 sn-316000
1961 sn-148635 1973 sn-199649 1985 sn-262256