IWC Schaffhausen Ingenieur Mode D'emploi page 26

— 2 6 —
– Push the crown back to position 0 to start the movement.
– Now push the crown to position X and secure it by simultan­
eously turning it to the right.
Important: The watch is water­resistant in positions 0, 1 and 2
as long as the crown is not moved. The crown should generally
always be screwed in for normal use to ensure the stability of the
seal and to protect the winding mechanism.
R E A D I N G T H E T I M E I N T H E D A R K
Both the dial and the hour, minute and seconds hands of your
watch have luminescent elements that allow you to read the time
effortlessly even in total darkness.
I N G E N I E U R C H R O N O G R A P H