Jaeger-LeCoultre

bjacknot
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Well well?

Well the lunar complication and the chronometer each draw a constant amount of energy, so if the watch is accurate, it will be accurate for each. If the only reason why this complication has two power sources is to move the hands, then I do not see any gains in efficiency-- all of this redundancy is just for moving the hands and/or the discs?

So what if you wanted to know the rate accuracy for the watch in each of the six positions? You could never get these measurements without either the hands/discs moving for the lunar complication and the chronometer-- each must move "in cog" with each other. You cannot stop the moon phase and get rate accuracy measurements, nor could you stop the hands and get rate measurements (unless you simply stop the mechanism). I do understand that they are separately-powered in this timepiece, but I just do not see the point. Individual moon phase accuracy is several orders of magnitude less significant than chronometer accuracy for use-ability.

The chronograph on the other hand (no pun intended) can be started and stopped and this will certainly affect the timing accuracy and likely for each complication. That influences the use-ability of the watch, and this is why I applaud JLC only for the chronograph application of the Duometre. Now if they could only make it look as good as the Lunar in WG!