I’m not really sure why watches do this, but it is a practice that is hugely misleading. On the backs on many watches there is almost always this bold claim of “water resistance” to a certain depth it can never actually reach. On the whole it is hugely misleading and likely to ruin a perfectly good watch.
To offer an example, the back of my own Khaki King Automatic makes a claim of water resistance to 50M:

Hamilton H64455533 Men’s Khaki King Automatic Black Dial Strap, Free Shipping
Now what does this actually mean? Does it mean that this watch can go 50 meters underwater?
The short answer is, NO!
If you think about it, what does “water resistant” really mean? I mean would you buy body armor that is simply “bullet resistance” rather than “bullet proof?” I mean I can claim that my car is elephant resistant, but if an elephant hurls its mass toward the side of my car, I doubt it would fare very well.
The truth is that the advertised water resistance of most watches is an outright lie, and that any watch that claims any degree of water resistant is not capable of going to the depths it advertises. If a watch claims 50-100 meters of water resistant it may be suitable for wading in the kiddie pool and things like water skiing, but I would be wary to take it even to 1/10th of its advertised depth. And while I may concede that 200 meters of water resistance can maybe handle some light dives, it can’t go anywhere near 200 meters of depth.
I know that this doesn’t apply to the vast majority of you desk jockeys out there, but if you seriously want to go to great depths you have to get a watch that can handle it.
So how do you know?
It’s simple, all you have to do is look for the “DIVERS” mark on the watch:

Seiko Diver’s Automatic 200M – Black Dial – Stainless Bracelet
If you are having trouble reading it, reads:
SEIKO
AUTOMATIC
DIVER’S 200m
Watches that make the bold “DIVERS,” or “DIVER’S” claim means that it has met a certain set of standards and is actually suitable for diving to depths that you may never go and then some. These watches can take the punishment so have at it.







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