It should be interesting, I would be surprised if they tested each individual watch, more likely the pull random samples from the production line. That being said though if they mark it on the dial it would be bad form if it didn't survive.
I while back I did a crush test on a Vostok and it surprised us by easily reaching over 600m (3x its rating)
while on the other side I once saw a 1000m Breitling stop at about 780m because the glass was touching the centre seconds hand.