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US Watch Company of Waltham Massachusetts Age determination by movement number
| Year
|
S/N |
| 1887
|
3000 |
| 1888
|
6500 |
| 1889
|
10,000 |
| 1890
|
30,000 |
| 1891
|
60,000 |
| 1892
|
90,000 |
| 1893
|
150,000 |
| 1894
|
200,000 |
| 1895
|
250,000
|
| Year
|
S/N
|
| 1896
|
300,000
|
| 1897
|
350,000
|
| 1898 |
400,000
|
| 1899
|
500,000
|
| 1900
|
600,000
|
| 1901
|
700,000
|
| 1902
|
750,000
|
| 1903
|
800,000
|
| -
|
-
|
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