Red button
on the left controls the upper 12 hour "Flight time" register.
It is a fly-back chronograph. Depressing the button starts, stops
and resets the timer. The square above the 6 o'clock position
will turn red when the chronograph function is activated. The
red button also winds the movement.
Right button starts and stops the whole timepieces. Twisting the
button counter-clockwise stops the whole clock and all of its
functions. Depressing the right button starts, stops, and resets
the bottom 60 minute register.
"Flight time" is written in Cyrillic in upper 12 hour chronograph.
Also on the dial numbers and letters: 2 CYTOK 82283 B