Here is a video with the Citizen octagonal “Bullhead” chronograph model 67-9356, calibre 8110A, that shows the chronograph function, start – stop – reset, and the fly-back function.
The video shows the fly-back in slow motion and the day-date setting.
For more information visit my blog and read the full article here:
vintagecitizenwatches.com/2013/12/24/citizen-bullhead-chronograph-67-9356/
Enjoy! :)