Longines age determination by serial number
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These are rough guidelines. They are based on the serial number and are not official production years; there may be discrepancies depending on the model and series.
| Serial number from |
Approximate year
|
|---|---|
| 1,000,000 | 1870 |
| 2,000,000 | 1880 |
| 3,000,000 | 1890 |
| 4,000,000 | 1897 |
| 5,000,000 | 1903 |
| 6,000,000 | 1908 |
| 7,000,000 | 1912 |
| 8,000,000 | 1916 |
| 9,000,000 | 1920 |
| 10,000,000 | 1924 |
| 12,000,000 | 1928 |
| 14,000,000 | 1932 |
| 16,000,000 | 1936 |
| 18,000,000 | 1940 |
| 20,000,000 | 1945 |
| 22,000,000 | 1948 |
| 24,000,000 | 1951 |
| 26,000,000 | 1954 |
| 28,000,000 | 1957 |
| 30,000,000 | 1960 |
| 32,000,000 | 1963 |
| 34,000,000 | 1966 |
| 36,000,000 | 1969 |
| 38,000,000 | 1972 |
| 40,000,000 | 1975 |
| 42,000,000 | 1978 |
| 44,000,000 | 1981 |
| 46,000,000 | 1984 |
| 48,000,000 | 1987 |
| 50,000,000 | 1990 |
