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Gruen Watch Serial Numbers*
| SERIAL #: | DATE: |
| 100,000 | 1939 |
| 175,000 | 1940 |
| 250,000 | 1941 |
| 400,000 | 1942 |
| 600,000 | 1943 |
| 750,000 | 1944 |
| 900,000 | 1945 |
| A 100,000 | 1945 |
| 1A 10,000 | 1945 |
| 1B 10,000 | 1945 |
| A 900,000 | 1947 |
| B 100,000 | 1947 |
| B 900,000 | 1949 |
| C 100,000 | 1950 |
| C 800,000 | 1952 |
* Table applies only to movement calibers 405,406,410,411,420,421,425.
Serial numbers are found on the movement of the watch.
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