The ONLY Seiko Movements You NEED To Know - Differences & Similarities
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- I DO offer watch modification services. IF interested please visit my website or email me for further details! eyoon319@gmail.com
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A fun fact you may have noticed about the movement identifiers: any modern movement that ends in "5" is date-only, but one that ends in "6" is day-date.
At the one which ends with 4 is GMT
@@MohitKumar-pl1hpmiyota 8N24 is not a gmt lol
@@Owwwwwwwwwwwwwwwwwwwwww I was talking about seiko NH movement about which video was about 🙄
@@Owwwwwwwwwwwwwwwwwwwwww my guy, this ain't a miyota video
@@theinceptor3672 I think I was trying to reply to someone else lol my bad
This is the best movement breakdown description and explanation video I've seen. Talking about "dumbing it down". Thank you.
I’m a simple man, I like and enjoy the 7S movement,
*_....plus, they are all reliable, durable and long lasting. They can go as long OR OFTEN LONGER than most mechanical movements of any price, between overhauls. Cleaned & oiled regularly, they can last a lifetime if not damaged by impact or corrosion._*
There are many more important and interesting Seiko movements than just the basic ass 7s26 and its prettier sisters...
Just looking at mechanical movements still in production (in one form or another) and ignoring the Spring Drives (which IMHO are really quartz watches) I can think of 4 more important movements:
1) and 2): The 9s65 and the 6s78:
The 9s65 is the OG automatic grand seiko movement. This was developed alongside the 6S78 column wheel chronograph (for their other top end sub-brand, Credor) in Seiko's Studio Shizukuishi which makes their top end movements.
The 9s65 is still being made (although it has unfairly been forced to take a second seat to spring drive) for Grand Seikos and in a less decorated finish as the 8L35 for marinemaster divers. The 6S78 design was sold off to Tag, and is no longer being used by Seiko - although Tag has the "01" (and before that the "1887") which is basically the same movement but made in Switzerland as an "in-house" movement.
3) You also have the 8r48, which is a more modern but less sophisticated column wheel successor to the 6S. Whilst having a column wheel, its a derivative of the more basic 7s/4r/6r base design. Its not quite just a module for a 6r15 but its not quite a dedicated chrongraph movement either - something in between the two. Its sold in upper mid range/lower high end watches - at the top of the Brightz, Presage etc. lines.
4) Another notable movement is the 4L25/6L35. The 4L25 used to sit where the 6r15 sits now - in the upper mid-range of Seiko's stable, below the top end (Grand Seiko, Credor etc.). But this was a much more sophisticated movement than the 6r15 which is basically a prettier and better finished 7s26. They phased this out in favour of the simpler (and presumably cheaper) 6r15 and its derivatives. The design was the basis of the Soprod swiss movements and that appeared to have been the end of it, but they have recently revived the movement as the 6L35 in their King Seiko "reissue" so hopefully we will see more of these in the £1k and above Seikos instead of just 6r15 and derivatives - which is basically the 7S "pig" with lipstick slathered all over it.
I just got into watch modding and this is by far the best content u have put out(only slightly edging the beginners tools, tutorials and advices). U have no idea how helpful this is it, oraybe u actually do caus u were once in our position. I hope u become as big as TGV one day. Cheers!
The memory man on watches good vid i now no all about my seiko many thanks
There are actually a portion of "6R/NE" caliber movements that are 4hz, 28,800vph. The 6R20, 6R21, 6R24, and the 6R27. The 6R21 is the branded version of the NE20. These are the power reserve models with varying jewel counts, as well as power reserve capacity. Some 6R's have 45 hours, some 50, and the 6R35 even has 70. I know that this was just meant to be an overview. Just sharing info. Great job
All reserved main spring is the same length but the fullever (automatic)now a days is commercial,there no bushing anymore, in the center of fullever,the it fast in wear and tear,thats the evereaday that I repair here in the Phillipines,I love 7009 or 7002 or 7019,it's durable since 1980's90's,thats the deferent of 7009 and 7s26
Great video that clearly explains the differences between 7S, 4R and 6R and that the NH and NE line used in micro brands
After 3-year full service at authorise Seiko SC, my 6R15 running at +2/-1 spd. Extremely grateful.
This is helpful; thorough without being overwhelming.
Great video. I wish you went through all the Seiko movements.
Not boring at all, very helpful and educational. Thank you
Amazing job of details and explination. It's definitely an accurate talk most people won't know. 👌
Such a great breakdown, thank you so much!
Thanks for info. I got my first Seiko because of you!
Great Job man! I love seiko. I have 1 SKX that I love with 7s movement. I also have two more divers with 4R36, also a Solar one and a a Quartz one. All of them reliable, beatufifull. Seiko is the best brand in the world for the money.
Excellent video! Thank you. I wish I had seen something like this a few years ago.
well said, thank you man, seriously your killing it and I love your videos.
cheers dude
This is great! I'm late to the party but I've been looking for this info everywhere. You have a new sub! Keep it up. Hoping to get you to make me a mod someday. Cheers!
This is the most complicated video that I ever watched but I totally understand everything he said considering this is the first video I watched about watch movement.
haha
Handwinding really isn't that great of a seller for replacing a 7s26. You shake it for a few seconds, put it on your wrist and it'll run fine.
Very helpful thank you. I've had my SRP777 since 2019 and just recently considering modding. Coin edge bezel and maybe different hands.
Superbly informative vid! Thanks
G'day,
I enjoyed the info but I need a little more please.
I upgraded from NH35b to NE15c. It cost me 4 times as much ($220) so, besides the 50 hour reserve, what other components make it higher horology? It's certainly still got the four nylon components on the dial side ! I imagine the spring is stronger but that's all. What info do you have please?
To me, who is quite new to this, this information was very valuable! Thank you so much!
You are a smart dude. Good video. I am a watchmaker who focuses on restoring pocketwatches but do repai the occasional watch and I did not know the relationship between 4R and NH.....thanks
Not boring at all, you are awesome and explain really well
Thank you for sharing your knowledge. Your videos are my great source of reference in Moding my Seikos
Which ones more reliable or long lasting. The 7s vs 4r?
Dude. Your explanation of the movements is the best. New subscriber here. ❤. Picking up the SRPE74 WTH the 4R36.
OUTSTANDING! Very well explained and informative. Thank you!
Boring to some to others a great wealth of information. You are awesome.
Great video. I have an older 6509 that I may need to upgrade the movement in. Your info is just what I needed.
That was awesome mate!! I was in 2minds about a purchase, but your info cleared it up. Cheers
Top of the line info bud,thanks for your video...right to the point
Very informative and helpful not boring 4r35 movement in two of my seiko Samurais and my SKX 7S movements all keep good enough Acuracy for my needs !
This is a really good way of explaining them. Thank you. Have you ever taken on a commission for something with an ETA or Sellita movement?
Thank you for info. What is the best seiko automatic movement?
Springdrive.
So helpful. I ended learning a lot!
Soooooo... I know that NH35 and NH36 are the same size and use the same handsets, but how about the 7S? I would love to add hacking and hand winding to my Seiko 5, so could I slap an NH36 in it and reuse the same hands? I suppose I could break out the calipers and measure the pinion et al, but I'm hoping you already have that info.
Great video. Newbie to Seiko so really helpful.
You break it down so we’ll. Good job man
100% not boring.....and very interesting and informative 👍
Thanks for the free lesson. 👍
Thank you for an excellent summary of Seiko movements 😊👍
The only watch I've owned in my life is a Gshock and I got that about a year ago... But I absolutely love watching your videos! I'm saving up to have my first automatic be one of the watches you've worked on :D
Do it my friend you won't regret it. I'd recommend starting with a SKX007
Just asking what is the model no for the watch at 3:16
Sorry I am new in seiko watchs😁
I believe the common assumption that the 4R/NH movements are always an _upgrade_ to the 7S is not entirely correct and is largely perpetuated for the sake of the mod. On paper, if the biggest difference is the lack of _hacking_ or _hand-winding_ and not frequency, power reserve or accuracy, the assumption is that hacking and hand-winding is _always_ better. The reality is that hacking and hand winding features(but also calendars and high beat) add complication to a movement which combined with human error or misuse can result in shorter service intervals, malfunction or failure of parts. Hacking typically means a setting lever physically stops the balance wheel which could in time effect beat error and amplitude. In any case the setting lever typically has to reach across the entire movement as the balance tends to be mounted opposite the winding stem plus a spring to hold it in place. These are points of failure. Additionally hand winding an auto, epically topping off power, isn't best practice as the rotor will keep winding past full. Hand winding an auto is only meant to be turned once or twice to get the watch going. In practice, the winding pinion has to engage, bypass or work alongside the automatic works which means much smaller, more delicate gearing in an auto as opposed to a true hand winder which is purpose built. Further, the mainspring of an auto is meant to slide along the barrel wall as a safely measure in the event of its being overwound - you cant stop a rotor from spinning. That being, hand-wining an auto more than a turn or two will increase the frequency a mainspring slipping, eventually waring away the inner barrel walls which can lead to inconsistent power transfer and reduced performance. Personally once you've experience a simple hand winder, there is nothing more unsatisfying or seemingly pointless then winding an auto. My ultimate point being, I believe Seiko intentionally designed the 7S to be a movement with as little human intervention as possible as to last as long as possible without service. I believe with the nh35, the idea is that with total ubiquity and low cost you can simply toss it once you break something.
Crushed it ,, Thanks !! Simple and to the point !! 🤛🏼
Very well put together video and very clear spoken information! Thank you for teaching me this!
A good, very informative, watchable and better video than others. So I think getting a date only seiko means it's better to go for 6r than 4r right? How is 6r in terms of reliability weight and serviceability worldwide as compared to 4r.
Im new to this currently building a tuna with an aftermarket case. I don't know if the movement is 3.8 and the case is 4 o'clock but it seems like it because crown entrance is way off. What to do in this situation before I buy another movement not knowing if it is the right one?
I'm doing a mod on my 7S26 SKX007, i am replacing the movement with a NH36 movement. now you say i need to change the day wheel to the 7S26 movement wheel, well i damaged it apon removal and went to buy a new one off Ebay but all the day wheels for sale say they fit 7S26 and NH36 movements. i confused, where can i purchase the right part.
Hi ! Is there any seiko sarb033 case like for custom build that will fit my snxs79 dial and hands ?
so this means that with the ability to regulate each movement, if i just want an accurate watch with +-1s i don’t need to buy the more expensive 6R movement, i could just use a cheaper 7s? or are there any more benefits in going for the more expensive movement if i just want the accuracy?
You're going to have a very hard time getting any automatic movement, let alone a Seiko (excluding Spring Drive) to be within +/-1 sec/day. And yes the more expensive movements will likely be more likely to be regulated closer to that and hold the variation more consistently. +/-1 sec on a timegrapher is quite a different thing that +/-1sec over the course of a month of wear.
Can you please check how similar the new 6r35 is to the 6r15?
Awesome job teaching and explaining young man. You put teachers with 30 years experience to shame.
does all movements fits modularly if i want to change the case
Thank you for making this video.. very informative 👍
Very nice and informative....
Thank u bro....
Im new to watches.
Is the nh35a movement good? Thank you
Great video. Thank you. Im trying to better understand this hobby and you clarified a few things for me.
So what movement not listed here is the most accurate Seiko automatic? Is there something better?
Thank you! Very well explained!
Would you mind doing and update video on this subject
Great video :) Explains a lot, could you tell me on the newer Megalith homage root beer (Jubilee strap) i'm led to believe its a YN55 movement thats in them, is this the same size as the NH35 movement ? Thanks
Thank you for this. Very informative.
Me own skx011, love the color, but bit hard to read the time on sunny day compare to skx007
Actually, the NH movements are made by Time Module in China, funded by Seiko, for other brands. They have less quality parts from the Seiko in house 4R movements. The 4R movements are the ones actually done by Seiko.
any idea what my seiko 5 7019-8180 movement has and what I could upgrade it with ?
I purchased a Seiko 5 Sports Automatic SRPG29K with a 4r36 movement in Australia in February 2023 and the world should know that this watch lost seven minutes in the 24 days of the first month of ownership. I advised the Seiko Australian supplier Linda and Co that the watch was faulty. They replied that it met the specifications so no warranty. Think about that before investing in a Seiko watch.... Robin T 28-March-2023
That's 15 seconds per day and within spec?
You can have someone regulate it better, probably, but you're not going to find a company that will replace a $200 watch because of 15sec/day.
If you want something certified to be at +/- 2sec, go buy a Rolex for 5-10x as much. Just be aware you'll need to have it serviced every year if you actually wear it or it will start to slip towards +/- 15.
My 4R36 runs at -2/day, and my 4R34 was +3/day for what its worth, both are factory regulated.
Why did I have to spend SO LONG to find a simple and rational explanation of these movements for which you'd think everyone would be looking? Thank Bokonon for you!
u got it so simple man. thank u so much for this
You didn’t cover the 6R35 and 6R54?
Love your videos! Just started getting into watch building and have 3 old 7s26 movements I am learning on. What size winder would I use to do mainspring cleaning. I would to do them one caliber at a time because of price. Love your moding vids!!
Great video. Very informative. Thanks!
great job explaining and simplifying !!
How is nh70a movement is it any good?
Interesting review. Regards.
Another amazing video. What movement would I use If I'm doing a rolex explorer type build with no day or date on the dial ?
Very informational, love it
Will hands from 6R35 fit on a 4R35 movement?
Can you replace a NH35 with a sweeping hand quartz VH31 without modifications? If not, which are the issues?
Thanks for information.
Can you use the crown from the nh35 in the nh36?
Great video dude!
I am new to mechanical watches . I have two Seikos with a 7S movement . Both seem very accurate while in operation . However the one that I prefer to wear stops much sooner than the other . Any ideas or tips ?
Good job. Exactly what I wanted to know.
Excellent video sir, this helped me very much.
This was very helpful thanks
What movement specs for NH 70 .
Thank you for the info sir ❤
What about spring drive?
How about the Solar movements like the V176?
7002 also no hand winding?
Duo you still mod, and how do we start ??
I have SKX007 models
Very informative video keep up the good work & increase the background illumination next time
That black watch with the purple/reddish glass is beautiful. Any idea how much that was/can be sold for?
Thanx, for me it was very informative 🙂