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The hour counter at the bottom will be halfway between 0 and 1. So you add the 30 minute counter to the hour counter (kinda, if you’re at 55 minutes the hour counter will nearly be at 1) and then read the seconds from the big hand (the seconds subdial on the left is the running seconds, not the chronograph seconds).
Never thought about the speedy subdials.
I get is hrs, mins, secs.
What happens after 30mins?