Water Resistance Guide

Water resistance ratings indicate the level of water exposure a watch is designed to withstand under laboratory testing conditions. These ratings are based on static pressure tests and should be used as general guidelines for everyday activities.

A watch marked with 30M, 50M, 100M, or any other water resistance rating on the dial or case back does not mean it can be used at that exact depth. The rating refers to the static pressure the watch can withstand. For example, a watch rated at 30M (3 ATM) is designed for light splashes, brief exposure to rain, and incidental contact with water while washing your hands. It is not intended for swimming, showering, snorkeling, diving, or prolonged exposure to water.

Water resistance is stated as a depth (ATM or Meters), but this rating is based on laboratory testing under controlled conditions for a short period of time. Actual conditions during use are much more demanding. Sudden impacts with water, diving into a pool, or vigorous arm movements while swimming can create pressures significantly greater than those experienced during testing.

As a general guideline, watches rated 100M (10 ATM) and above are suitable for swimming. Watches rated 200M to 1000M are designed for more extensive underwater use and typically feature a screw-down crown and additional construction features to help maintain water resistance during water-related activities.

When using a watch in or around water, do not pull out the crown to adjust the time. If the watch is equipped with a screw-down crown or pushers, ensure they are fully secured before the watch is submerged. Exposure to water may also shorten the lifespan of a leather strap and should therefore be avoided.

Water resistance is not permanent. Over time, seals and gaskets naturally wear and lose their effectiveness. Exposure to chemicals such as chlorine, salt water, perfumes, lotions, aerosol sprays, and other cosmetics may accelerate this process and reduce the watch's ability to resist water.

To help maintain water resistance, watches should be tested periodically and serviced as necessary. Seals and gaskets should be inspected and replaced when required to ensure continued protection against water intrusion.