Those are not current photos I suspect. The chronograph seconds and minutes resetting when you stop the chronograph indicates that the part called the "stem bolt for hammer" is missing or broken, but it's present in those photos. This video (of an 861 but it's the same principle) shows the start, stop, and reset when the stem bolt for hammer is in place, and what happens when it's missing:
The pusher at 4 is still required to reset the hour counter by the way, but you may not be letting it run long enough to even see the hour counter move.
Cheers, Al
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