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Usually the flyback function is controlled by the button at 4 o'clock whereas the one at 2 o'clock is used to stop the chronograph.
A flyback converter stores energy as a magnetic field in the inductor air gap during the time the converter switching element (transistor) is conducting.
The flyback converter can be viewed as two inductors sharing a common core.
This slows down (lengthens) the flyback time from the extremely rapid decay rate that would result if they were electrically isolated during this short period.
Most flyback chronographs are constructed with the usual crown at 3 o'clock and 2 pushpieces at 2 and 4 o'clock.
This is a mechanically-switched version of a flyback boost converter with an autotransformer (the ignition coil).
While it looks superficially like a flyback converter, it operates in a fundamentally different way, and is generally more energy efficient.
When the switch turns off, the stored magnetic field collapses and the energy is transferred to the output of the flyback converter as electric current.
