If you note any discrepancies, or have additional information concerning this company, please contact us here at Horn-u-copia.
| year | number |
| 1876 | 1 |
| 1877 | 700 |
| 1878 | 1700 |
| 1879 | 3000 |
| 1880 | 5000 |
| 1881 | 6000 |
| 1882 | 7000 |
| 1883 | 8000 |
| 1884 | 9000 |
| 1885 | 10,500 |
| 1886 | 12,000 |
| 1887 | 13,000 |
| 1888 | 14,000 |
| 1889 | 16,500 |
| 1890 | 18,000 |
| 1891 | 20,000 |
| 1892 | 22,500 |
| 1893 | 25,000 |
| 1894 | 27,500 |
| 1895 | 29,000 |
| 1896 | 34,000 |
| 1897 | 40,000 |
| 1898 | 46,700 |
| 1899 | 52,000 |
| 1900 | 58,000 |
| 1901 | 66,700 |
| 1902 | 71,000 |
| 1903 | 76,000 |
| 1904 | 82,000 |
| 1905 | 88,000 |
| 1906 | 94,000 |
| 1907 | 100,000 |
| 1908 | 106,000 |
| 1909 | 111,000 |
| 1910 | 116,000 |
| 1911 | 121,000 |
| 1912 | 126,000 |
| 1913 | 130,150 |
| 1914 | 132,400 |
| 1915 | 137,000 |
| 1916 | 142,575 |
| 1917 | 146,600 |
| 1918 | 155,000 |
| 1919 | 165,900 |
| 1920 | 169,500 |
| 1921 | 175,500 |
| 1922 | 190,450 |
| 1923 | 198,475 |
| 1924 | 206,700 |
| 1925 | 219,850 |
| 1926 | 230,900 |
| 1927 | 239,500 |
| 1928 | 252,900 |
| 1929 | 263,200 |
| 1930 | 273,700 |
| 1931 | 280,130 |
| 1932 | 281,360 |
| 1933 | 289,743 |
| 1934 | 294,687 |
| 1935 | 300,690 |
| 1936 | 307,996 |
| 1937 | 315,575 |
| 1938 | 322,650 |
| 1939 | 324,859 |
| 1940 | 327,850 |
| 1941 | 338,500 |
| 1942 | 348,150 |
| 1943 | 354,600 |
| 1944 | 355,500 |
| 1945 | 355,750 |
| 1946 | 355,850 |
| 1947 | 366,650 |
| 1948 | 376,100 |
| 1949 | 383,650 |
| 1950 | 389,600 |
| 1951 | 396,300 |
| 1952 | 393,301 |
| 1953 | 420,057 |
| 1954 | 427,301 |
| 1955 | 500,001 |
| 1956 | 571,850 |
| 1957 | 652002 |
| 1958 | 718,626 |
| 1959 | 779,657 |
| 1960 | 834,200 |
| 1961 | 898,556 |
| 1962 | 949,465 |
| 1963 | C00501 |
| 1964 | C73854 |
| 1965 | E54106 |
| 1966 | H31247 |
| 1967 | K35274 |
| 1968 | L20454 |
| 1969 | "M" prefix |
| 1970 | "N" prefix |
| 1971 | "P" prefix |
| 1972 | "R" prefix |
| 1973 | GA30000 |
| 1974 | GA40000 |
| 1975 | GA50000 |
| 1976 | GA60000 |
| 1977 | GA70000 |
| 1978 | GA80000 |
| 1979 | GA90000 |
| 1980 | HA00000 |
| 1981 | HA16500 |
| 1982 | HA23431 |
| 1983 | HA33389 |
| 1984 | HA45522 |
| 1985 | HA58992 |
| 1986 | HA68842 |
| 1987 | HA76618 |
The years 1967 to March 1974 (when Conn moved their brass manufacturing to Abilene, Texas), is a period where at least some of the instruments were inferior in quality
In March of 1974 an alpha-numeric system was established:
The first character of the serial number indicated the decade;
The second character indicated the month of the year;
The third character indicated the year within the decade (defined by the first letter).
The fourth character indicated the instrument:
The remaining numbers indicated the production number within the month.
From 1987 on, the two-digit prefix number plus 50 will give you the year of manufacture.
Sources:
Allied Supply
Music Trader