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    Re: Chronometers after radio time signals
    From: Alexandre Eremenko
    Date: 2007 Oct 23, 13:31 -0400

    One problem is that you never know for sure
    when you buy:-)
    My first Casio watch ($25) run 12 years on the
    original battery, to 10 seconds per year accuracy.
    I used it until the plastic case was brocken.
    The second casio watch (of exactly the same type)
    runs much worse.
    On Tue, 23 Oct 2007, Dan Allen wrote:
    > On 23 Oct 2007, at 10:47 AM, Gary LaPook wrote:
    > > I bought a Torgoen dual time zone watch for about $175.00 on
    > > October 12, 2004, three years ago, and, so far, it has gained only
    > > 14 seconds, and the rate has been very consistent.
    > That is almost too good to be true!
    > Do you have a model number for this watch?  Do you know if it is a
    > twin-quartz, or an oversampled quartz movement?  Typical quartz
    > watches run 15 seconds a month, and there are only a very, very few
    > that have these additional technologies which generally improve
    > accuracy to around 15 seconds a year.
    > I have, for example, a certain Seiko SLL033 with the oversampled
    > 176KHz movement good to around 20 seconds a year.  I also have an
    > Omega 1552.30 good to around 15 seconds.  These are hard watches to
    > find, and in addition, they often change movements year to year so
    > you have to really check things out to ensure that you can find a
    > truly accurate watch.
    > I have a Citizen solar powered WR 200 Perpetual Calendar which makes
    > no claims for high accuracy and yet it has given almost the same
    > accuracy.  Quartz watches are affected by temperatures and sometimes
    > if you have a watch at a constant temperature the randomness cancels
    > and you get high accuracy, but it is not guaranteed across different
    > examples of the same watch.
    > Dan
    > >
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