iwc 3254 Operating Instructions Manual page 16

Functions of the crown
Normal position
In the normal position (position 0), you can wind the movement by rotating
the crown in a clockwise direction. You should always wind the watch
completely until the resistance of the crown is felt. Your watch has a power
reserve of 46 hours. You should wind your watch fully every day to achieve
maximum accuracy.
Setting the time
Pull the crown to position 1. This will stop the movement. To ensure that
the set time is accurate to the second, it is best to stop the movement as
the seconds hand reaches 60. You can now position the minute hand
exactly on the minute line. To start the seconds hand, push the crown back
to position 0.
0 1
0 Normal position,
Winding position
1 Time setting