50 BRAND NEW SEIKO WATCHES TESTED | ARE THEY REALLY THAT BAD?
Master Watchmaker
23,505 views
50 brand new Seiko watches. One model. One production batch. One movement: the Seiko 6R35.
But how consistent are they really?
In this video, two professional watchmakers put 50 brand new Seiko watches through a serious test. This is not a review based on one sample, one opinion or a few days of wearing the watch.
We collected real data.
First, we test the timekeeping accuracy of all 50 watches and look at how closely each movement performs compared with Seiko's advertised specification.
Then we go further.
We examine:
• Timekeeping accuracy
• Consistency between individual watches
• The probability of randomly buying a particularly accurate example
• What the Seiko accuracy specification actually means in real life
• How many watches perform within a much tighter accuracy range than the official specification
• Bezel alignment
• Hand alignment
• Date change consistency
• Crown winding and operation
• Overall quality control
And perhaps most importantly, we explain what mechanical watch accuracy actually means.
Is a watch gaining five seconds a day accurate?
What does 10 seconds per day really represent?
How significant is the difference between a watch running +5 seconds and +15 seconds per day?
And if you walked into a shop and picked one of these 50 watches at random, what are the chances of getting a movement that performs significantly better than the specification promised by Seiko?
The answers are based on real measurements, real watches and professional testing.
The Seiko 6R35 has developed a reputation among watch enthusiasts. Some owners are perfectly happy with it. Others have experienced disappointing accuracy. But until you test a large number of watches from the same model and production batch, it is difficult to know whether an individual watch represents the rule—or the exception.
So we decided to find out.
50 watches. Real data. No guessing.
The results genuinely surprised us.
If you own a Seiko with a 6R35 movement—or are thinking about buying one—this is a video you should watch before making up your mind about Seiko mechanical accuracy.
20 Comments
• Mean (x̄): 9.80 s/d
• Standard Deviation (s): 7.10 s/d
• Standard Error (SE): 1.12 s/d
• 95% Confidence Interval: [7.53, 12.07] s/d
I was always very lucky with 4r and 7s movements running withinin 0-+10.
be full of customer watches complaining over 3 or 5 seconds a day. If you are hung up on accuracy spend a lot more on a watch or buy a quartz.
Looking forward to receiving my one of fifty.
50 BRAND NEW SEIKO WATCHES TESTED | ARE THEY REALLY THAT BAD?
Master Watchmaker
23,505 views
50 brand new Seiko watches. One model. One production batch. One movement: the Seiko 6R35.
But how consistent are they really?
In this video, two professional watchmakers put 50 brand new Seiko watches through a serious test. This is not a review based on one sample, one opinion or a few days of wearing the watch.
We collected real data.
First, we test the timekeeping accuracy of all 50 watches and look at how closely each movement performs compared with Seiko's advertised specification.
Then we go further.
We examine:
• Timekeeping accuracy
• Consistency between individual watches
• The probability of randomly buying a particularly accurate example
• What the Seiko accuracy specification actually means in real life
• How many watches perform within a much tighter accuracy range than the official specification
• Bezel alignment
• Hand alignment
• Date change consistency
• Crown winding and operation
• Overall quality control
And perhaps most importantly, we explain what mechanical watch accuracy actually means.
Is a watch gaining five seconds a day accurate?
What does 10 seconds per day really represent?
How significant is the difference between a watch running +5 seconds and +15 seconds per day?
And if you walked into a shop and picked one of these 50 watches at random, what are the chances of getting a movement that performs significantly better than the specification promised by Seiko?
The answers are based on real measurements, real watches and professional testing.
The Seiko 6R35 has developed a reputation among watch enthusiasts. Some owners are perfectly happy with it. Others have experienced disappointing accuracy. But until you test a large number of watches from the same model and production batch, it is difficult to know whether an individual watch represents the rule—or the exception.
So we decided to find out.
50 watches. Real data. No guessing.
The results genuinely surprised us.
If you own a Seiko with a 6R35 movement—or are thinking about buying one—this is a video you should watch before making up your mind about Seiko mechanical accuracy.