I purchased this Luminox colormark orange when they first came out.  I was really excited about the looks and functioinality.  The first time I was able to use it for diving it was a miserable failure and fogged up the whole time I had it in the water.  I would not recommend this watch at all.  It is advertised as a military multi use navy seal type watch and it is basically only for looks.  I talked to my watch dealer who sells these things and they said if the crown does not screw down then do not use it in the water.  The crown does not screw down on the luminox colormark so potentially that could be the problem.  It would be so bad if the watch was not advertised as a durable heavy use diving and military watch but it is and this is a big problem.  The watch is not cheap either so for 200 bucks you should get a lot more.  You would be better served buying a different brand if you are going to have this thing in the water a lot.