Table of case serial numbers and their corresponding years of manufacture.
The serial number is located on the movement of each Longines watch, either on the back or under the dial.
| YEAR OF ISSUE | SERIAL NUMBER | YEAR OF ISSUE | SERIAL NUMBER |
| 1870 | 20,000 | 1925 | 4,250,000 |
| 1871 | 36,000 | 1926 | 4,500,000 |
| 1872 | 52,000 | 1927 | 4,625,000 |
| 1873 | 68,000 | 1928 | 4,750,000 |
| 1874 | 84,000 | 1929 | 4,886,360 |
| 1875 | 100,000 | 1930 | 4,959,088 |
| 1876 | 121,425 | 1931 | 5,031,816 |
| 1876 | 121,425 | 1932 | 5,104,544 |
| 1877 | 142,850 | 1933 | 5,177,272 |
| 1878 | 164,275 | 1934 | 5,250,000 |
| 1879 | 185,700 | 1935 | 5,333,330 |
| 1880 | 207,125 | 1936 | 5,416,660 |
| 1881 | 228,550 | 1937 | 5,500,000 |
| 1882 | 250,000 | 1938 | 5,750,000 |
| 1883 | 291,670 | 1939 | 5,850,000 |
| 1884 | 333,340 | 1940 | 5,950,000 |
| 1885 | 375,010 | 1941 | 6,140,900 |
| 1886 | 416,680 | 1942 | 6,331,800 |
| 1887 | 458,350 | 1943 | 6,522,700 |
| 1888 | 500,000 | 1944 | 6,713,600 |
| 1889 | 550,000 | 1945 | 6,904,500 |
| 1900 | 1,124,715 | 1946 | 7,106,750 |
| 1901 | 1,250,000 | 1947 | 7,309,000 |
| 1902 | 2,083,333 | 1948 | 7,511,250 |
| 1903 | 2,916,666 | 1949 | 7,713,500 |
| 1904 | 1,500,000 | 1950 | 7,915,750 |
| 1905 | 1,750,000 | 1951 | 8,225,535 |
| 1906 | 1,850,000 | 1952 | 8,535,320 |
| 1907 | 1,950,000 | 1953 | 8,845,105 |
| 1908 | 2,100,000 | 1954 | 9,183,125 |
| 1909 | 2,250,000 | 1955 | 9,521,145 |
| 1910 | 2,375,000 | 1956 | 9,859,165 |
| 1911 | 2,500,000 | 1957 | 10,201,415 |
| 1912 | 2,750,000 | 1958 | 10,543,665 |
| 1913 | 3,250,000 | 1959 | 10,885,915 |
| 1914 | 3,250,000 | 1960 | 11,211,988 |
| 1916 | 3,375,000 | 1961 | 11,538,061 |
| 1917 | 3,500,000 | 1962 | 11,864,134 |
| 1918 | 3,625,000 | 1963 | 12,116,548 |
| 1919 | 3,750,000 | 1964 | 12,368,962 |
| 1920 | 3,815,217 | 1965 | 12,621,376 |
| 1921 | 3,880,434 | 1966 | 12,873,790 |
| 1922 | 3,945,651 | 1967 | 13,839,112 |
| 1923 | 4,047,100 | 1968 | 14,834,158 |
| 1924 | 4,148,549 |
History of the LONGINES logo by year of production (approximately):
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