The deepest I have ever taken a watch was 280m, the deepest I have ever seen a watch go was 335m. Both were gen Seadwellers. I have taken Seikos as deep as 230m with no ill effect. In my opinion most of the ridiculous depth ratings are nothing but gee whiz facts so some jerk-off who never gets his watch deeper than the swimming pool can say " it's rated to 1000m" so what! I have found most any decent Seiko or Citizen or Casio can handle a lot more depth than the typical owner will ever take it. Of course in decompression the Casios almost always blow up because they have no crown to unscrew so Helium expansion becomes a problem. If your watch ever goes 1000m either it will be going there without you or you won't care about your watch at that point!