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F P Journe/Philippe Dufour Inquiry...

Does anyone have an opinion on the relative merits of the F P Journe ?Chronometre a Resonance?, and Philippe DuFour?s ?Duality??

What particularly interests me is the concept of sympathetic resonance, and how it is utilized in each design. Presumably, the transmission medium with the F P Journe is the air between the two balance wheels? With the Duality I?m guessing that the transmission medium is the structure of the watch itself? As an ancillary point, does anyone have an opinion on the merits of sympathetic resonance itself?

Thank you for any thoughts you might have to share on this.

Regards,

Andrew.