Orient DA 40R Instruction Manual page 27

 HOW TO USE THE INTERNAL ROTATING INDICATOR RING
Turn the crown for the internal rotating indicator ring to set the 60-mark to the
position of the minute hand.
The position of the internal rotating indicator ring to which the minute hand is
pointing after some time has elapsed indicates the elapsed time.
Setting the mark to the desired time also allows you to know the remaining
time.
* The positions of the crown and the appearance of the internal rotating
indicator ring may differ depending on the model.
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