The pushbuttons for the stopwatch on the SeMPC are held in place by a tiny circlip on the end of the pin. If the button can be removed from the watch, the circlip has broken (as happened to mine)or fallen off.
It wasn't noticeable until the watch filled with water. I found the pieces of the circlip when I opened the watch - otherwise they could have gone into the mechanism.
I do check the pushbuttons occasionally now to make sure they can't be pulled out.
: Interesting - I wasn't aware that the crown
: would take 30 atmospheres UNSCREWED and
: still be watertight. Obviously, the pushers
: for the stopwatch have to take the same
: pressure while they are being used, but they
: don't screw down. The used 2296.80 that a
: dealer ran in on me had the seals on the
: pusher strip out, so you could pull it right
: out of the watch. There are a whole series
: of gaskets in there rather than just a
: single one.
: Despite the crown being watertight unscrewed,
: there is absolutely NO reason to ever have
: to rely on this fact. An SeMP keeps time
: perfect enough that you never have to reset
: it unless you have an O/C disorder, so the
: ONLY reason you need to unscrew the crown is
: for 3 minutes at the end of months with less
: than 31 days in them, and when you travel
: through different time zones. Other than
: that, you should LEAVE the watch on your
: wrist 16/7 (or 24/7 if you sleep with it on)
: and enjoy it!
