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  1. #21
    Member zuiko's Avatar
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    Re: Accuracy of Grand Seiko Spring Drive

    My SBGC013 that has the gold stamp on the rotor was less than 0.5 seconds out after 6 months when I wore it continuously as my only watch. Even 0.5 is overstating it. It is by far my most accurate mechanical SD watch.

  2. #22
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    Re: Accuracy of Grand Seiko Spring Drive

    Wow. That's amazing. I've never tested mine. Now it's back from a service I'll have to check. SBDB001
    Keith.
    Portsmouth, UK.
    Rolex Submariner 114060
    Seiko Prospex Marinemaster Spring Drive SBDB001
    Omega SMPc 300m Co-Axial 41mm Blue

  3. #23
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    Re: Accuracy of Grand Seiko Spring Drive

    One other point, these watches do not suffer from the positional variations experienced by purely mechanical designs.

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  5. #24
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    Re: Accuracy of Grand Seiko Spring Drive

    How does one check the accuracy of a watch, I have a Spring Drive, synced time with an auto about 3 weeks ago now theres about 5 seconds difference between the two

    Im not overly bothered but I am aware because I set them.
    What's your current watch collec...... 'IT DOESN'T MATTER!!!!!!"

    A dingo ate my Black Bay

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  6. #25
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    Re: Accuracy of Grand Seiko Spring Drive

    Quote Originally Posted by Prince Escalus View Post
    How does one check the accuracy of a watch, I have a Spring Drive, synced time with an auto about 3 weeks ago now theres about 5 seconds difference between the two

    Im not overly bothered but I am aware because I set them.
    The WatchTracker app on the iPhone is pretty good. It has a graph to track changes over time.

    I'm kind of curious: what's the worst accuracy you've seen on a spring drive? Seiko is conservative with their ratings so it seems not many come close to the +/- 15 sec per month.

  7. #26
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    Re: Accuracy of Grand Seiko Spring Drive

    I have my doubts about the watchtracker app - I check time two ways, with the app, and also against the Time.is clock.
    The app gives worse accuracy figures than a daily check against the clock.
    But since these are mechanical watches, what is a second or three a day, after all?
    Last edited by whineboy; February 1st, 2017 at 17:49.
    whineboy

  8. #27
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    Re: Accuracy of Grand Seiko Spring Drive

    Quote Originally Posted by JK919 View Post
    .............. I'm kind of curious: what's the worst accuracy you've seen on a spring drive? Seiko is conservative with their ratings so it seems not many come close to the +/- 15 sec per month.
    I own a SBGA011 Snowflake. It gains one second every three days, so, + 10 sec per month. It would be interesting to hear if any SD owners approach the
    +​ 15 sec/mth.

  9. #28
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    Re: Accuracy of Grand Seiko Spring Drive

    Quote Originally Posted by RickS72 View Post
    I own a SBGA011 Snowflake. It gains one second every three days, so, + 10 sec per month. It would be interesting to hear if any SD owners approach the
    +​ 15 sec/mth.
    The OP seems to... but I find it hard to believe. He seems thrilled anyway though ;) I hope he's mistaken, because 1 sec/day is way over than it should be.
    Mine has always been about 3 seconds per month. It's on a longer than usual run in my rotation now; on Christmas eve I set it about 1.5sec slow and today it's about 1.8 fast (yes eyeballing :)). So +3.3sec in 39 days; 0.085s/day; about 2.55/month

    My question is, if timing is pretty much dependent on the crystal, will these watches always run at their current known deviations provided the gears are properly serviced? If you don't like your Jedi lightsaber crystal, can you ask them to replace it at service? Or would they automatically tend to change the crystal during a full service, and those with super awesome crystals might lose theirs? I'm quite happy with mine. But obviously some have it better than others.
    Last edited by bluedialer; February 1st, 2017 at 21:30.

  10. #29
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    Re: Accuracy of Grand Seiko Spring Drive

    I must get a GS SD. I'm fascinated with it. My SBGV 027 quartz is right on without a second's difference on WatchTracker after a month. Clearly the Spring Drive will never reach that accuracy level, but for an essentially mechanical watch (albeit Quartz regulated) to be as accurate as everyone says is wonderful, my Tudor Black Bay is very good for accuracy but it gains about 3 spd, my newly serviced Rolex Datejust is a little more than that. Also the GS watches are quite unique in beauty. Post pictures please!


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  11. #30
    AKM
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    Re: Accuracy of Grand Seiko Spring Drive

    Quote Originally Posted by RickS72 View Post
    I own a SBGA011 Snowflake. It gains one second every three days, so, + 10 sec per month. It would be interesting to hear if any SD owners approach the
    +​ 15 sec/mth.
    My SBGE027 also gains one second every three days and I had it from new. Perhaps it will slow down over time.

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