The Helium Escape Valve - Everything You Need to Know | Bob's Watches
Why Does Your Rolex Have a Hole in Its Side?
OMEGA on Twitter: "#SeamasterDiver Small but mighty. There's a helium escape valve on every Diver 300M. https://t.co/7OdZEFncJ6 https://t.co/yZmj3at7Em" / Twitter
Why Does Your Rolex Have a Hole in Its Side?
Holding Under Pressure - Explaining The Helium Escape Valve