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Patek Philippe

If the movement matches with the case number you are all fine

 

Excluding any typo error which I doubt very much from Patek Philippe!

There are 2 possible reasons.  
1. The movement was replaced with the same new old stock originally made in 'Date'
2. It was produced with a new old stock movement


So long the watch movement number matches the watch case number you are doing fine.

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