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I understand they need to be regulated to the same frequency in order to achieve resonance but I think it's safe to assume that at the smallest level they are not identical because then it would all be pointless.

 

My point being, could one of the balances be overall more accurate than the other in which case having two balances is detrimental to time keeping? Given that a single balance is easier to regulate, practically a single balance might be the more accurate architecture ala the chronometre optimum. If it is a matter of shock, then would something like the Armin Strom be a better solution to synchronize the balances more quickly? Or even a single balance working at a higher frequency? I see how a double balance architecture could in concept improve time keeping, I'm just questioning whether that plays out in reality. I just wonder if it is like the traditional single plane tourbillion, romantic and beautiful but not necessarily something to drive time keeping.

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