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They are difficult to regulate because both sides need to be regulated to almost perfection in all 6 positions. That is hard in any watch.

 

From what I have been explained by a watchmaker a watch can be well regulated in 5 positions and the watchmaker can "hide" the irregularities in the 6th position. The Resonance is unforgiving in that way. you need regulating in 6 positions x 2 to be within a delta of 5 seconds. That is a lot of patience and work to get there.

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