Here is a video with the Citizen octagonal “Bullhead” chronograph model 67-9356, that shows the chronograph function, start – stop – reset, and the fly-back function.  Also you can see the day date settings.

The video shows the fly-back in slow motion.

Enjoy! 🙂

Here is a more detailed article about this wonderful vintage Citizen flyback chronograph.

https://vintagecitizenwatches.com/2013/12/24/citizen-bullhead-chronograph-67-935