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Vacheron Constantin

the movement numbers are not discontinuous, ...

 

the movements are in-house production, if there is a number lower than yours than your movement is later production.
...
628 xxx from 1972
63x xxx from 1972 is number 628 xxx + 2 xxx movements for your watch
634 xxx from 1973
651 xxx from 1973
...
For authentification case numbers of secondary interest, because the case numbers follow the manufacturer intervall, therefore they are never same continuous like movement - there were often several different manufacturers working for V&C at the same time.

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