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LeCoultre Atmos Clock Serial Numbers
| DATE | SERIAL # | MODEL / CALIBER |
| 1945-1959 | 25000-59000 | 519 |
| 1950-1959 | 60000-69999 | 522 |
| 1950-1959 | 70000-106999 | 526-5 |
| 1960-1980 | 107000-599999 | 526-6; 528 |
| 1980-1998 | 600000 + | 540 |
Serial numbers are generally located on the movement of the
timepiece. Serial numbers are approximate.
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