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To both Derek's,.......(more).
In Response To: Re: -4 to +6 sec per day wondering... ()

: A mechanical movement running slower can be a
: sign of excess friction or other problems in
: its assembly.

Couldn't it been just improper factory adjustment of the watch? BTW is there a factory policy of gaining only adjustment? My SeMPch slows down as well as others that I've heard about.

: Also, the COSC standard is for testing watch
: movements *before* they are made into
: watches, so that allows for how mechnical
: watch movements tend to slow down a little
: as they settle in.

As much as I realize (I may be wrong), They could have allowed from a variety of deviations like -5 to +5 or -3 to +7 or 0 to +10 and so on, if to keep deviation of max 10 sec. All I'm asking is why did they decide on -4 to +6 sec/day? If they were considering gaining only they could have decided on 0 to +10 sec. Otherwise why not symmetrical -5 to +5 sec decision?

I hope I made myself clear since English isn't my home language.

Thanks a lot
Baruch.

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