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    Re: Chronometers after radio time signals
    From: Dan Allen
    Date: 2007 Oct 23, 11:16 -0600

    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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