Water resistance is one of the most misunderstood—and often misused—features of a wristwatch. You may see “30M” or “50M” on the dial and think, “Great! I can take this swimming.” But not so fast. Water resistance doesn’t always mean what it seems.
In this guide, we’ll break down what water resistance ratings really mean, explain how they apply to daily wear, and offer simple tips to protect your SeaGull watch for years to come. Whether you’re caught in the rain or planning a tropical vacation, you’ll know exactly what your timepiece can handle—and what it can’t.
Understanding Water Resistance Ratings
Let’s start with the basics. The number on your watch—such as 30M, 50M, or 100M—doesn’t represent how deep you can go underwater with it. These numbers are based on standardized laboratory tests under static conditions, not real-life movement in water.
Here’s a breakdown of the most common ratings:
30M (3 ATM) – Splash resistant only. Suitable for daily wear, like hand-washing or light rain. Not safe for swimming or submersion.
50M (5 ATM) – Light water contact. You can wear it while showering or washing the car, but not for swimming or diving.
100M (10 ATM) – Swimming approved. Suitable for swimming and snorkeling, but not for diving or high-impact water sports.
200M+ (20 ATM) – Diving ready. Suitable for most water activities, including recreational scuba diving.
So, if your watch says “30M,” don’t let that “meters” mislead you—you should not go swimming with it.
The Real Risks: What Damages a Watch
Water damage isn’t always dramatic. It can start small—fog under the crystal, or corrosion around the crown. Over time, even minimal water intrusion can cause irreversible damage to the movement or dial, especially in mechanical watches like SeaGull’s.
The biggest culprits?
Hot water: Heat expands gaskets and may let moisture in—avoid hot showers or saunas.
Sudden pressure changes: Jumping into a pool causes more pressure than static immersion, which can overwhelm the seals.
Improper use of the crown: If the crown is pulled out or not screwed in securely, water can easily seep in.
Best Practices for Protecting Your Watch
Here are a few simple habits that can go a long way:
Know your rating – Always check your watch’s specifications before exposing it to water. Not all SeaGull models are designed for aquatic use.
Use the crown carefully – Never adjust the time or date when your watch is wet. Ensure the crown is fully pushed in (and screwed down, if applicable) before any water exposure.
Avoid hot environments – Saunas, hot tubs, or even sunbathing for long periods can weaken seals. Stick to cooler conditions when water is involved.
Rinse after saltwater – If you swim in the ocean, rinse the watch gently with fresh water and dry it thoroughly to avoid salt buildup.
Regular service – Water resistance isn’t permanent. Gaskets can wear out over time, so it’s a good idea to get your watch’s seals checked every 1–2 years, especially if you use it in wet environments.
SeaGull’s Approach to Water Resistance
SeaGull watches are built with craftsmanship and reliability in mind. Many of our sports and diver models come with 100M or 200M ratings, making them excellent companions for daily wear and active lifestyles. However, some of our classic or vintage-inspired models are designed more for elegance than for water-based adventures.
If you're looking for a watch to wear in the pool or on the beach, we recommend browsing SeaGull’s sports or dive collections that feature screw-down crowns, reinforced seals, and high-grade stainless steel cases.
The key takeaway? Water resistance is a tool, not a guarantee. Even the toughest watch needs proper handling and care. By understanding the true meaning of those “30M” or “100M” markings, and by using your SeaGull watch wisely, you can ensure it stays as beautiful and precise as the day you bought it.
Want to explore water-ready models? Discover SeaGull’s collection of mechanical watches designed for both performance and style.
Let your watch handle the water—on your terms.
