Please have in mind that the time table for the Longines serial numbers is not 100% accurate but very close to +/- 1 years.
Dating back your vintage Longines watch by using the serial number is the most exact way to identify your watch.
Note that the Longines serial numbers are usually found engraved on the in- & out-side of the back case.
| Year of Production | Serial Number # |
|---|---|
| 1870 | 20 |
| 1871 | 36 |
| 1872 | 52 |
| 1873 | 68 |
| 1874 | 84 |
| 1875 | 100 |
| 1876 | 121.4 |
| 1877 | 142.8 |
| 1878 | 164.3 |
| 1879 | 185.7 |
| 1880 | 207.1 |
| 1881 | 228.5 |
| 1882 | 250 |
| 1883 | 291.7 |
| 1884 | 300 |
| 1885 | 333.3 |
| 1886 | 375 |
| 1887 | 416.7 |
| 1888 | 458.35 |
| 1889 | 500 |
| 1890 | 600 |
| 1891 | 650 |
| 1892 | 700 |
| 1893 | 750 |
| 1894 | 791.1 |
| 1895 | 832.8 |
| 1896 | 874.4 |
| 1897 | 916 |
| 1898 | 957.8 |
| 1899 | 999.4 |
| 1900 | 1.124.700 |
| 1901 | 1.250.000 |
| 1902 | 1.320.000 |
| 1903 | 1.440.000 |
| 1904 | 1.500.000 |
| 1905 | 1.750.000 |
| 1906 | 1.850.000 |
| 1907 | 1.950.000 |
| 1908 | 2.100.000 |
| 1909 | 2.250.000 |
| 1910 | 2.375.000 |
| 1911 | 2.500.000 |
| 1912 | 2.750.000 |
| 1913 | 2.900.000 |
| 1914 | 3.075.000 |
| 1915 | 3.250.000 |
| 1916 | 3.750.000 |
| 1917 | 3.500.000 |
| 1918 | 3.625.000 |
| 1919 | 3.750.000 |
| 1920 | 3.815.000 |
| 1921 | 3.880.400 |
| 1922 | 3.945.600 |
| 1923 | 4.047.000 |
| 1924 | 4.031.000 |
| 1925 | 4.148.500 |
| 1926 | 4.500.000 |
| 1927 | 4.625.000 |
| 1928 | 4.750.000 |
| 1929 | 4.886.000 |
| 1930 | 4.959.000 |
| 1931 | 5.031.800 |
| 1932 | 5.104.500 |
| 1933 | 5.177.000 |
| 1934 | 5.250.000 |
| 1935 | 5.333.000 |
| 1936 | 5.416.000 |
| 1937 | 5.500.000 |
| 1938 | 5.750.000 |
| 1939 | 5.850.000 |
| 1940 | 5.950.000 |
| 1941 | 6.140.000 |
| 1942 | 6.332.000 |
| 1943 | 6.523.000 |
| 1944 | 6.714.000 |
| 1945 | 6.905.000 |
| 1946 | 7.107.000 |
| 1947 | 7.309.000 |
| 1948 | 7.511.000 |
| 1949 | 7.713.000 |
| 1950 | 7.915.000 |
| 1951 | 8.225.000 |
| 1952 | 8.535.000 |
| 1953 | 8.845.000 |
| 1954 | 9.183.000 |
| 1955 | 9.521.000 |
| 1956 | 9.859.000 |
| 1957 | 10.201.000 |
| 1958 | 10.544.000 |
| 1959 | 10.886.000 |
| 1960 | 11.212.000 |
| 1961 | 11.538.000 |
| 1962 | 11.864.000 |
| 1963 | 12.116.000 |
| 1964 | 12.368.000 |
| 1965 | 12.621.000 |
| 1966 | 12.874.000 |
| 1967 | 13.839.000 |
| 1968 | 14.834.000 |
| 1969 | 15.000.000 |