IWC Schaffhausen Portugieser Automatic Mode D'emploi page 22

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p O W e r r e s e r v e d i s p l a y
The power reserve display is divided into 7 days with continuous
display. The winding mechanism winds the watch continuously
while you are wearing it, and you can follow the process on the
power reserve indicator. The marking in the area of the last day
tells you that the power reserve is about to expire. You should
then wind the watch by hand, if necessary, since the precision
can be reduced in this area.
p O r t u g i e s e r a u t O M a t i c