Sub dials are there to show something important that the main face can't?
Second hands aren't really an additional complication when they work perfectly well on the main face.
Personally, I don’t get mechanical watches with no seconds hand. To me, it might as well be quartz. One of the things I dig the most about mechanical watches is the sweeping seconds hand.
This.
@PawG started
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Sub dials are there to show something important that the main face can't?
Second hands aren't really an additional complication when they work perfectly well on the main face.