Waltham Watch Serial Number List
| serial number | year | serial number | year | serial number | year |
| 1,000 | 1857 | 4,882,000 | 1890 | 24,400,000 | 1923 |
| 14,000 | 1858 | 5,000,000 | 1891 | 24,600,000 | 1924 |
| 17,000 | 1859 | 6,000,000 | 1892 | 24,800,000 | 1925 |
| 20,000 | 1860 | 6,400,000 | 1893 | 25,000,000 | 1926 |
| 23,000 | 1861 | 6,650,000 | 1894 | 26,000,000 | 1927 |
| 34,000 | 1862 | 7,000,000 | 1895 | 26,500,000 | 1928 |
| 46,000 | 1863 | 7,500,000 | 1896 | 27,000,000 | 1929 |
| 118,000 | 1864 | 8,000,000 | 1897 | 27,200,000 | 1930 |
| 190,000 | 1865 | 8,500,000 | 1898 | 27,400,000 | 1931 |
| 262,000 | 1866 | 9,000,000 | 1899 | 27,600,000 | 1932 |
| 335,000 | 1867 | 9,550,000 | 1900 | 27,800,000 | 1933 |
| 410,000 | 1868 | 10,000,000 | 1901 | 28,000,000 | 1934 |
| 470,000 | 1869 | 11,000,000 | 1902 | 28,500,000 | 1935 |
| 500,000 | 1870 | 12,000,000 | 1903 | 29,000,000 | 1936 |
| 550,000 | 1871 | 13,000,000 | 1904 | 29,300,000 | 1937 |
| 600,000 | 1872 | 14,000,000 | 1905 | 29,700,000 | 1938 |
| 691,000 | 1873 | 14,500,000 | 1906 | 30,300,000 | 1939 |
| 720,000 | 1874 | 15,000,000 | 1907 | 30,600,000 | 1940 |
| 791,000 | 1875 | 17,000,000 | 1908 | 30,700,000 | 1941 |
| 800,000 | 1876 | 17,500,000 | 1909 | 31,000,000 | 1942 |
| 900,000 | 1877 | 18,000,000 | 1910 | 31,370,000 | 1943 |
| 1,000,000 | 1878 | 18,030,000 | 1911 | 31,650,000 | 1944 |
| 1,500,000 | 1879 | 18,060,000 | 1912 | 32,000,000 | 1945 |
| 1,000,000 | 1880 | 19,000,000 | 1913 | 32,600,000 | 1946 |
| 1,675,000 | 1881 | 20,000,000 | 1914 | 32,700,000 | 1947 |
| 1,837,000 | 1882 | 20,300,000 | 1915 | 33,000,000 | 1948 |
| 2,000,000 | 1883 | 20,700,000 | 1916 | 33,449,000 | 1949 |
| 2,356,000 | 1884 | 21,000,000 | 1917 | 33,558,000 | 1950 |
| 2,650,000 | 1885 | 22,000,000 | 1918 | 33,600,000 | 1951 |
| 3,000,000 | 1886 | 23,000,000 | 1919 | 33,700,000 | 1952 |
| 3,300,000 | 1887 | 23,500,000 | 1920 | 33,830,000 | 1953 |
| 3,700,000 | 1888 | 24,000,000 | 1921 | ||
| 4,000,000 | 1889 | 24,200,000 | 1922 |
These are approximate production dates. Oftentimes, a block of serial numbers would be assigned and the movement plates blanked out; then the plates would be stored in the warehouse and finished as demand required. So, it is possible that a watch could have been completed some years after the serial number date.