TYPE 5 is equipped with a locking mechanism for the back case.
The outer-ring beneath the case can be turned in two positions:
LOCK or SETUP
A coloured triangle indicates its position.
The ring should ALWAYS be positioned in LOCK.
Only when the watch needs to be set or manually winded,
this bottom ring must be turned into SETUP position.
NEVER TURN THE OUTER-RING UNDER WATER
SETUP & LOCK