Accuracy of Grand Seiko Spring Drive
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  1. #1
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    Smile Accuracy of Grand Seiko Spring Drive

    I'm obsessed with the accuracy of mechanical watch. I'm fascinated with how a mechanical watch can attain an accuracy as good as a quartz and how the second hand sweeps continuously and smoothly.

    My first Grand Seiko from Japan is a automatic, I'm not at all impressed with it accuracy, it gains more after 9 months although it eventually got regulated to an acceptable range.

    I had concluded that spring drive is the way to go.

    During my holiday in a small town in Malaysia, I came across a brand new SGBA003, the authorised dealer gave me a very good discount, as good as I get it in Japan, maybe even better. I bought it. It's running slightly more than +1 sec per day. I'm impressed.

    .....then few weeks later, in the pre-own market, I came across a full set SBGA111. The deal was too good to walk away. Even though wife is grumbling, I bought it. This watch is even better. It is less than +1 sec per day! I hardly notice any drift !

    I think for limited edition watch, Seiko use a better crystal.

    Now, I'm the proud owner of 2 Grand Seiko Spring Drive.
    Last edited by skyWalker; January 12th, 2017 at 18:54.

  2. #2
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    Re: Accuracy of Grand Seiko Spring Drive

    Congrats!! The SBGA111 is a real beauty!

  3. #3
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    Re: Accuracy of Grand Seiko Spring Drive

    skyWalker, I agree with you regarding mechanical accuracy. My 1-month old SBGW035 is +6 seconds/day (but it is very consistent).
    My $700 Hamilton Jazzmaster is +/- 1 second/day.
    The GS is slightly prettier, however.
    Maybe my next GS will be an SD. Thanks for tempting me.
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    Re: Accuracy of Grand Seiko Spring Drive

    The SBGD001 is roughly +5 seconds in a month.

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    Re: Accuracy of Grand Seiko Spring Drive

    I don't even check the accuracy of my Spring Drive anymore haha. My SBGE001 is about 4 seconds fast after I don't even know how many months anymore I reckon it has been more than 4 months. I can only imagine the SBGA103 is the same if not better considering it is guaranteed to be more accurate.

    Regarding the mechanical Grand Seikos my old SBGR053 was consistently less than 1 second off a day after I had it regulated so the 9S series of movement can be very accurate.
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    Re: Accuracy of Grand Seiko Spring Drive

    Everything being equal, is it true that some crystals/quartz are better than the others ?

    Or the crystal is the constant whereas the rest are the ones affecting the accuracy ?

    I thought after all these years, crystal should have insignificant deviations from each other....

  8. #7
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    Re: Accuracy of Grand Seiko Spring Drive

    Spring Drive technology is unique and super geeky cool... Enjoy!
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    Re: Accuracy of Grand Seiko Spring Drive

    My understanding is that Seiko "grows" their own crystals. The higher end GS get first dibs on the better quality quartz. It seems that all quartz is not equal. I am simply rehashing what I read elsewhere on understanding spring drives -my appreciation for them has grown.


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    Re: Accuracy of Grand Seiko Spring Drive

    Quote Originally Posted by skyWalker View Post
    Everything being equal, is it true that some crystals/quartz are better than the others ?

    Or the crystal is the constant whereas the rest are the ones affecting the accuracy ?

    I thought after all these years, crystal should have insignificant deviations from each other....
    On a quartz or Spring Drive the crystal would be the biggest determinant of accuracy. I know some of the limited Grand Seiko Spring Drive models are guaranteed to be more accurate because they have specially selected quartz crystals, not because the going train is made to a higher tolerance.
    mleok likes this.

  11. #10
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    Re: Accuracy of Grand Seiko Spring Drive

    Quote Originally Posted by Allan_de_dub View Post
    On a quartz or Spring Drive the crystal would be the biggest determinant of accuracy. I know some of the limited Grand Seiko Spring Drive models are guaranteed to be more accurate because they have specially selected quartz crystals, not because the going train is made to a higher tolerance.
    That is supposedly true. My SBGA105 has the "super spring drive". But honestly we are probably taking .1 to .2 seconds every few weeks. Spring drive alone is VERY accurate.

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