I found this, is the MC Memovox operation the same?
"Setting the alarm
Winding
Turn the compression key to the “open” position in the
direction of the arrow. Crown A will then be in position 1.
The alarm is wound by turning the crown clockwise. When
winding is complete, the crown is locked.
Setting the alarm time
Pull crown A out to position 2. This function enables you
to adjust the alarm’s mobile disc by turning the crown
anti-clockwise, to position the triangular mark situated in
the centre of the dial over the desired chime time. When
the operation is completed, push crown A back into
position 1.
Switching the alarm on or off
The alarm is activated when crown A is in position 1. It is
stopped when the crown is in position 2. Therefore the
chime can be stopped at any time by pulling out crown
A. However, note that the crown must be pushed back
into position 1 to ensure water-resistance. When the
operation is completed, turn the compression key to the
“closed” position in the direction of the arrows."