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1 November 2023, 11:03 AM | #1 |
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Spring Drive (SBGA413) - Long Term Accuracy
After getting my Grand Seiko SBGA413, in large part because of the spring drive technology, I decided to measure the long term accuracy over a full year. I'm 20 weeks in and thought I'd describe the results so far. (During this 20 week period I found myself in Scotland for 10 days; refused to change the time to the local time zone.)
I'm impressed with the accuracy; but, after searching posts on this site, I've found others reporting 0 or 1 second after 3 months?! Code:
Date (weeks) Error (sec) Rate (sec/week) Rate (sec/day) 06/13/2023 ( 0) 0 07/18/2023 ( 5) +5 1.0 0.14 08/22/2023 (10) +7.5 0.75 0.107 09/26/2023 (15) +11.5 0.77 0.11 10/31/2023 (20) +15.1 0.755 0.108 Total error is +15 seconds over about 4 1/2 months which is well below the stated accuracy of 15 seconds per month. Should I be disappointed? I'm keen to keep the test going for a full year - which will mean handling daylight savings time by presetting the error when changing the time. We'll see how the watch handles the frigid winters. Cheers. |
1 November 2023, 04:35 PM | #2 |
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Real Name: Basil
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Hi, congrats on the beautiful cherry blossom and welcome to the forum.
I think your accuracy is fine. My SBGE245 gains about 2,5" a month. Both are well within GS's claimed accuracy. I wouldn't be surprised to see outliers on either side of the spectrum though. I know first hand just how spoiled can someone become with the GS SD accuracy. Don't let that mess with your ownership experience. Enjoy your watch.
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1 November 2023, 05:03 PM | #3 |
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Seems well within specs, enjoy your 413, it's a beauty.
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1 November 2023, 05:03 PM | #4 | |
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Quote:
+15s over 4.5 months = +3.3s/m. The stated accuracy can’t be 15seconds/month. You mean 15 seconds/year?
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1 November 2023, 06:15 PM | #5 |
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That's a SD movement, Eddie, not a quartz. So 15' / month is about right iirc.
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1 November 2023, 06:21 PM | #6 |
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That was my point Basil - why should Gozoner be disappointed with 3.3s/month?
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1 November 2023, 06:23 PM | #7 |
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Ahh got it now It's easy to get spoiled by the SD accuracy. I know I am.
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2 November 2023, 03:46 AM | #8 |
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1 November 2023, 06:18 PM | #9 |
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Welcome to the forum! Beautiful time piece congratulations!!! Specs look correct.
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2 November 2023, 05:30 AM | #10 |
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I've had two spring drive equipped watches.
SBGE275 which tends to gain about 2 seconds every 2 - 3 weeks. SBGE255 which gained about 2 seconds a week??? I think. Cant really remember. |
7 November 2023, 10:15 PM | #11 |
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My snowflake loses only 1 second a week, so 4 seconds per month. I have had it for 15 months now.
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7 November 2023, 11:27 PM | #12 |
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I don't know how you can live with such deviance from atomic time
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16 November 2023, 02:14 PM | #13 |
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All SD movements are highly accurate, but the newer one is even more
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17 November 2023, 09:44 AM | #14 |
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Best movement on the planet
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17 November 2023, 09:51 AM | #15 |
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Mine is about 1 second per week... by the time I need to change the time for daylight savings or advance the month on a 30 day month, the accumulated error isn't even enough to worry about. It is one of my favorites in the box and I find I wear it more than almost any other.
Enjoy - you'll need to adjust it before the error matters too much. |
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