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A thermally compensated crystal is one or two orders of magnitude more accurate than a ten dollar Casio or Timex. Less than one second per year.

That said, mostly you are right, a 5 million dollar patek will sell a few copies to someone...

It's good to be king I guess.

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http://www.sapphytimes.com/movement/ephoto_show.asp?PhotoID=...

This is just "normal" price. For a large production you can get an even larger discount. It's still a cheap movement.

And that's a standard quartz; the specs say -10 to 20 s/month.

Still ~10x more accurate than a mechanical watch, but not ~200x more accurate as thermocompensated ones are (as mentioned in the message you were replying to).

Your body heat makes an excellent oven for a wristwatch.

I've found the opposite. A cheap Casio lost less than a second in two years sitting on my desk, but a whole second in the month I wore it.

What. Both of those are insanely good numbers.

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