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Vacheron Constantin

The motivation for the dual balance system...

 

in my view is to avoid the trouble of resetting the calendar after the watch ran out of power. So they need a long power reserve in a manual watch to avoid this. I don't think it is accuracy driven, although this system allows for a 5 Hz "active" balance wheel that should run very accurately.
You bring up some very good questions! I love your idea of having two balance wheels that run simultaneously and average out the accuracy. After the Tourbillon and the Resonance, this could be a huge innovation!
Thanks a lot for your thoughts and comments, Patrick, I appreciate it a lot.
Daniel

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