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Patek Philippe

5712 losing power reserve on watch winder

 

Apologies in advance if this is a stupid question.

From what I understand, the 5712 has a unidirectional rotor.
I have recently started to put mine on an Underwood winder, which goes 30 minutes clockwise, then 30 minutes counterclockwise, then stops for 3 hours before repeating the cycle.
I noticed that the watch loses around 10 hours of power reserve each day when on the winder.
Is this normal? Will getting a unidirectional winder help?

Many thanks in advance for your help & comments.

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