Breguet MARINE HAUTE JOAILLERIE 9509 Mode D'emploi page 8

Setting the time
Pull the crown into position X2 so as to stop the seconds
hand when it reaches 12 o'clock, then turn the crown
downwards to advance the hands until the desired time.
To set a precise time, ensure that the final rotation is
conducted in the clockwise direction.
Then push the crown into position X1.
The 9509 watch withstands an over-pressure
of 1.5 bar which is equivalent to the hydrostatic
pressure exerted by the water at a depth of 15 metres,
provided that the crown is in position X1.
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