iwc IW5449 Operating Instructions Manual page 16

Functions of the crown
Normal position
With the crown in the normal position (0), you can wind the watch by turn-
ing the crown clockwise. Always wind the watch fully, to the point at
which you feel a distinct resistance in the crown. Your watch has a power
reserve of 46 hours. To ensure maximum accuracy, you should fully
wind your watch every day as a matter of routine.
0 Normal position
1 Time setting
0 1