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Re: Isochronism
In Response To: Isochronism ()

: gain. It appears this watch exhibits very
: poor isochronistic performance. How does
: COSC address isochronism? Is it time for a
: trip to the watchmaker?

Mechanicals usually do. You want significant consistency in timekeeping, then quartz is the technology to look to. Quartz has none of the gravity, wear and lubrication variances that are inherent in traditional mechanical movements.

COSC addresses this by testing mechanicals at a wide range of positions and temperatures. What they do not test is the long term consistency. As watch movements settle in, their behavior changes somewhat. So it is not unusual to need a tweak to the accuracy adjustment after 6 months or so.

All COSC really tests is that the movement is capable of working satisfactorily -- when properly adjusted based on its current condition. Over time, the condition of the watch movement changes, which is why mechanical watches are made to be be easily adjusted to put them back to right.

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Isochronism
Re: Isochronism
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