Shower with crown unscrewed

[watchmaker]

Only if you've managed to create a seal such that the water has nowhere else to go, and the the pressure of the water jet exceeds the seal's pressure resistance. Otherwise, you've found magic water that defies fluid dynamics (or you're testing a watch with faulty seals).

A relatively light jet of water on an unscrewed crown or a non screw down crown can cause water ingress. This is professional experience not my opinion.

The most important word in that sentence is 'can'. This will not always be the case but it does happen. There are numerous contributing factors: age of seals, condition of seals, water pressure, water temperature, contaminants present in water to name a few.

It is a little disingenuous to quote only part of my answer when the second section supports the point you are making about faulty seals.

I offered professional advice that supports the majority of what has already been said previously in the thread with the addition of a point that seemed to have been missed. There are multiple TechXperts on this forum for a reason

[nickrolex]

"My Rolex is bleeding"....... It's a Rolex!!! It doesn't have time to bleed!!!!!!! lol... Seriously, your mocking it's craftsmanship to think a drop of water will tarnish that fine piece of art.