In message <[EMAIL PROTECTED]>, "Schneuwly, Dominik" writes:
>Hi Mike,
>Hi Mike,
>
>Have you checked high precision quartz watch mouvements? Longines, a =
>Swiss watch manufacturer, uses a quartz mouvement called "Calibre L546" =
>with +/- 10 seconds per year accuracy. It runs for 10 years (!) on a =
>watch-size Lithium battery.

Read the small print:  This is only guaranteed if you wear the watch always.
They rely on your body-temperature for keeping the xtal at a stable temperature.

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