>
> > and doppelfederhaus means double spring house literally
>
> The ab-auf hand is the power reserve indicator. "Doppelfederhaus" is
> "double barrel", meaning the watch has a double mainspring barrel.
>

The advantage of the double mainspring barrel is that with most spring powered
clocks the winding and the power for the clock are taken from the same side of
the spring.  Therefor the clock is not powered during winding so it can loose
some time.  If a clock has a double mainspring barrel that means the clock is
so accurate the effort to fix a fractional second error is worth it.
--
Dan Johnson

http://www.geocities.com/zapob

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