iwc 3713 Instrucciones De Manejo página 24

Reading the time in the dark
The dial as well as the hour and minute hands of your watch are provided
with luminous elements which permit the time to be read without problem,
even in total darkness. The luminous element at 12.00 serves as a refe-
rence point.
Water-resistance
Your IWC Official Agent must perform a new water-resistance test every
time your IWC watch is opened and serviced.
Recommendation: We recommend that you have your watch's water-
resistance tested once a year by an approved IWC Official Agent.