Grand Seiko VFA: An Experiment in Accuracy
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Grand Seiko VFA: An Experiment in Accuracy

By KIH · Dec 14, 2012 · 18 replies
KIH
WPS member · Horological Meandering forum
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KIH's post delves into an extraordinary experiment with a 40-year-old Grand Seiko VFA, adjusted by a legendary Seiko watchmaker known as the "God of Adjustment." This article highlights the remarkable accuracy achieved by a vintage mechanical timepiece through expert human intervention, challenging perceptions of what's possible outside modern chronometer standards. KIH's detailed account and photographic evidence underscore the enduring quality of Grand Seiko movements and the unparalleled skill of master watchmakers.

An Experiment on GS VFA

As you may remember my post on the "father of the modern GS" or "God of adjustment", he seemed to have "God's hands".  To prove or disprove what he claims he can, he and I agreed to do an experiment.

Read here=> interviews.watchprosite.com

Not that such a huge epoch-making experiment with big fanfare, but I just asked him to adjust my 40 some years old GS VFA and he agreed to do it.  Please note that he still is an employee of the company and he didn't take any money and he would NOT do this for anybody (but, wait until he retires... smile).

This report won't need lots of words.  Just see it to believe it.  I swear the subject was not tampered or re-adjusted during the experiment.

- After I received the "adjusted" GS VFA, I decided to wear it for a while to see how it would really work.
- But I had to be away and I had to leave it on the winder for the last five days.
- Honestly, I was more than impressed.  About a second or two in 10 days (5 days fully worn, 5 days on winder).
- This particular model is way before his time, but he said that it was well designed and made and that is why he could adjust it so well. 
- Bottom line: he can adjust any watches, but it has to be GOOD one to begin with in order to achieve such super accuracy.

Okay, here you go!


The night I received the adjusted VFA.  Dial up.




Dial down




12h down




Crown up




Crown down




12h up - NOT included in COSC standard




Comparison with the reference watch - GS Quartz (+/- 10sec per year)
Before the start of experiment - Day 1 (2 sec late - didn't adjust after I got it back, meaning this has not been adjusted for more than a week in his bag )





After full day of wearing: Day 2 - 3 sec late




Worn all day: Day 3 - 1.5 sec late





Worn all day: Day 4 - 1.5 sec late





Worn all day: Day 5 - 1.5 sec late





Had to leave it on winder for five days - Day 10 - 2 sec late.




How stable this is!


Hope you like it!

Ken

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The Discussion
NI
nilomis
Dec 14, 2012

Wonderful. I share with you the joy to wear a watch that is working this way. Perfect. Congratulations to you, your watch and, of course, for the "God" of adjustment, Nilo

KI
KIH
Dec 14, 2012

... I like the mechanical watch to be as accurate as possible. Quartz is supposed to be accurate and it is good but not that exciting. Mechanical watch with this level of accuracy is really exciting. Especially for a watch 40 some years old. Thanks! Ken

DR
Dr No
Dec 14, 2012

. . . Andrew . . . . . . and Andrew, meet Ken. :-)

KI
KIH
Dec 14, 2012

I know, I know.... But I am not a perfectionist. Well, maybe "a perfectionist to the extent practical" :-) Ken

OP
Ophiuchus
Dec 14, 2012

I'm actually a watchmaker, and that is very impressive timing. Not unheard of, but extremely rare. People who can time a 40 yr. old watch out to that spec are very few indeed. I speak Japanese, and would kill to meet the "God of Adjustment", buy him a bottle of Kubota Manjyu, and sit and talk timing for even 10 minutes. I doubt I will ever get the chance, but it's somehow so encouraging to know that a mechanical can indeed reach such accuracy by human hand. The knowledge this gentleman has is im

KI
KIH
Dec 14, 2012

.. I might be able to arrange something :-) Besides, he travels a lot to train the service center watchmakers worldwide, so he may stop by your town.... Yes, indeed this is magnificent! Ken

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