Rockford Watch Co. / Rockford Age Determination by Movement Number
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Rockford Watch Co.: |
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| serial number | year |
| 8,000 | 1876 |
| 18,000 | 1877 |
| 30,000 | 1878 |
| 40,000 | 1879 |
| 50,000 | 1880 |
| 60,000 | 1881 |
| 70,000 | 1882 |
| 80,000 | 1883 |
| 90,000 | 1884 |
| 104,000 | 1885 |
| 116,000 | 1886 |
| 128,000 | 1887 |
| 140,000 | 1888 |
| 152,000 | 1889 |
| 164,000 | 1890 |
| 176,000 | 1891 |
| 198,000 | 1892 |
| 234,000 | 1894 |
| 294,000 | 1896 |
| 324,000 | 1897 |
| 354.00 | 1898 |
| 384,000 | 1899 |
| 414,000 | 1900 |
| 448,000 | 1901 |
| 481,000 | 1902 |
| 550,000 | 1904 |
| 655,000 | 1907 |
| 730,000 | 1909 |
| 815,000 | 1911 |
| 850,000 | 1912 |
| 880,000 | 1913 |
| 930,000 | 1914 |
| 936,000 | 1915 |