The watch requires good daily care
Do not wash the watch when its crown is in the extended position.
Wipe away moisture, sweat or dirt with a soft cloth.
After soaking the watch in seawater, be sure to wash the watch in clean pure water and wipe it dry carefully.
Do not pour running water directly from a faucet onto the watch. Put some water into a bowl first, and then soak the watch in the water to wash it.
Turn the crown from time to time
In order to prevent corrosion of the crown, turn the crown from time to time.
The same practice should be applied to a screw down crown.