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QUESTION: If my son’s IWC Da Vinci perpetual

 

calendar rattrapante’s day is off from the date can that be corrected or does it need to be adjusted by the factory? There are no pushers correctors and everything is apparently pre programmed as to date, day, moon phase and year. So I am wondering if there is a way to move just the day of the week? Any help is much appreciated. Thank you!

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