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Patek Philippe

Caliber 28-20/220 is COSC certified,

 

so I would except it to be quite accurate, just like the 8 days power reserve calibre of my Quattro Spirit 25 (in the case of this jumping hour watch, the accuracy is very palpable because the hourly click of the jumping disc invites you to check the time and see if its spot on time, which it is to within a few seconds).

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