https://ijl.ca/blogs/the-jewel/3-thi...ter-resistance
They are not talking about depth.…
Hmmmnnn!!!
30m? Immersion or merely splashing water?
“ Rolex is the only brand I know of that actually uses the word "waterproof" for their watches, everyone else seems to use the words "water resistance".
“ You should not take your watch swimming unless it says 10 bar or 100M or more in water resistance. Anything less and basically it can handle humidity, rain, or splashes of water while you're doing the dishes.”
5811 .. . Water-resistant to 30 m. Screw-down crown. Even with a screw down down it still does not say “waterproof.”