Check in advance whether your watch is water-resistant or waterproof. Water-repellent models are only protected against light splashing water and are not suitable for use under water. A water-repellent watch will not withstand heavy rain or showers. When washing your hands, be careful with a water-repellent watch.
With a water-resistant model, it is essential that the crown is firmly closed before use under water. In addition, you should never operate the pushers under water.
In addition, have your watch checked for water-resistance regularly, at least once a year, at a specialist shop.
Vintage models should not be brought into contact with water, as these watches are very sensitive.