Been a daily beater for well over 12 months 24/7 day and night, its been subjected to paint, oil, boiling water, acid, sand, saltwater, paint dust, all kinds of knocks and beatings, its still waterproof and keeps good time although the power reserve isn't how it used to be, I have to wind it every few days when kept on my wrist unfortunately, for almost a year I've never had to wind it (although I did now and then!) when it finally stopped working after 12+ months I prepared some tools and a clean area, removed the caseback and took high resolution pictures of the movement quickly replaced caseback and studdied them for hours, I used tc's movement pictures from his blog and found a screw to be missing so I proceeded to remove The caseback and I find the missing screw, caseback back on I sharpen my smallest screwdriver, take the back off again re-insert and carefully tighten the missing screw and also check/tighten other visible screw heads, hey presto we have life! Everything has been good since!