I could very well be wrong, but I think that's how it's supposed to work. The minute sundial will tick over each time the large Chrono second hand gets back to 60 sec. The hour subdial will slowly slide around proportionate to how much of each hour has gone by. In your posted pic, beautiful watch by the way, you are at exactly 22 minutes on the minute subdial and 52/60 of the way to one hour on the hour subdial. Hope that makes sense to you.
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