ロンジン ムーブメント製造年代推定表
| 年 | ムーブメントナンバー |
| 1867 | 1 |
| 1870 | 20,000 |
| 1875 | 100,000 |
| 1882 | 250,000 |
| 1888 | 500,000 |
| 1893 | 750,000 |
| 1899 | 1,000,000 |
| 1901 | 1,250,000 |
| 1904 | 1,500,000 |
| 1905 | 1,750,000 |
| 1907 | 2,000,000 |
| 1909 | 2,250,000 |
| 1911 | 2,500,000 |
| 1912 | 2,750,000 |
| 1913 | 3,000,000 |
| 1915 | 3,250,000 |
| 1917 | 3,500,000 |
| 1919 | 3,750,000 |
| 1922 | 4,000,000 |
| 1925 | 4,250,000 |
| 1926 | 4,500,000 |
| 1928 | 4,750,000 |
| 1929 | 5,000,000 |
| 1934 | 5,250,000 |
| 1937 | 5,500,000 |
| 1938 | 5,750,000 |
| 1940 | 6,000,000 |
| 1945 | 7,000,000 |
| 1950 | 8,000,000 |
| 1953 | 9,000,000 |
| 1956 | 10,000,000 |
| 1959 | 11,000,000 |
| 1962 | 12,000,000 |
| 1966 | 13,000,000 |
| 1967 | 14,000,000 |
| 1969 | 15,000,000 |
資料： 「COMPLETE PRICE GUIDE TO WATCH 2000」