Seiko Caliber 4r35b Drawing

Seiko Caliber 4R35

Seiko Caliber 4r35b Drawing

Manufacturer Seiko
Caliber Number 4R35, 4R35A, 4R35B
Movement Type Automatic
Diameter
27.4mm (casing 27mm)
Thickness
5.32mm
Jewels 24 23 (see below)
Vibrations Per Hour
21,600 bph
Lift Angle
52 or 53 degrees (see below)
Power Reserve
~40 hours
Hand Windable? Yes
Hand Winding Direction
Clockwise
Rotor Direction
Bi-directional (Magic Lever)
Hacking? Yes
Anti-Shock System
Seiko Diashock
Regulator System
ETACHRON
Functions Hours, minutes, central seconds, date calendar at 3:00
Country of Manufacture Japan
Known Models
(Add yours in the comments below…)

The Seiko caliber 4R35 is an automatic used by Seiko Watch Corp. in their own branded watches. This movement was released circa 2011. This caliber was considered to be an upgrade from the popular 7S26 movement as it offers the user the desirable hacking and hand-winding functionality.

In Seiko’s own words:

“SEIKO Automatic mechanical Cal. 4R35A is developed based on Cal. 7S series and Cal. 6R series design with two specifications as follows: 1. Manual winding function. 2. Second hand stop function for time setting (2nd click position of the crown).”

Caliber 4R35 VS SII NH35:

The caliber 4R35 is basically a Seiko-only version of the NH35A. Seiko Instruments (aka SII) sells the NH35 to other manufacturers for use in non-Seiko watches. At the time of this post, the 4R35B has 23 jewels and the NH35A has 24 jewels (see below).

Caliber 4R35 VS 4R36:

There is also a similar caliber 4R36. The difference between the two is that the 4R35 has a date calendar complication at 3:00, and the caliber 4R36 has a day/date at 3:00. Everything else is the same, including dimensions, jewels, accuracy, etc. Despite tech sheet misinformation, the caliber 4R35B has 23 jewels and the 4R36A has 24 jewels (see below).

Differences Between 4R35A and 4R35B?

The “A” in 4R35A indicates that it is the first generation of this caliber. The official tech sheets show that the 4R35B was an upgrade from the original caliber where Seiko increased the jewel count from 23 to 24 jewels see update below. This happens to be the same jewel count at the 4R36 mentioned above, so it could be for ease of production and documentation. Other differences as listed in the technical docs:

  • Lift Angle: 4R35A = 52 degrees / 4R35B = 53 degrees
  • Power Reserve: 4R35A = 41 hours / 4R35B = 40 hours

Update: It appears that the parts lists for the 4R35A and 4R35B show a difference of at least 23 individual parts. Seiko has even updated their tech sheets with more information regarding the difference between A vs B.

In Seiko’s own words:

“SEIKO Automatic Mechanical Cal.4R35B is replacement caliber of Cal.4R35A. Construction of B series are same as A series, but using new parts. Since the size of the movement is same as A series, the complete movement can be assembled into the watches which originally have the A series movement; however, as the parts are not convertible, please use the appropriate parts for each caliber. The difference between Cal.4R35 and Cal.4R36 is a calendar mechanism” –source

UPDATE: 23 or 24 Jewels Confusion

There is much confusion in the watch community around the caliber 4R35B jewel count. Blogs and watch sellers often refer to the 4R35B as having 24 jewels, this is because that is what Seiko’s official documentation has stated since the tech sheets were published in 2011. Interestingly, the conflicting information in the tech sheet appears to be caused by Seiko combining the calibers 4R35B and 4R36A in one document. The original 4R35A had its own tech sheet. The rotor drawing on the 4R35A shows the caliber number and jewel count spelled out (as it would look on an actual watch), however, the 4R35B/4R36A drawing has a blank rotor without any markings, continuing the cause for confusion.

We have not seen a caliber 4R35B powered watch with rotor markings indicating 24 jewels. The Caliber Corner Community is also backing up the discrepancy in the comments below, so we reached out directly to Seiko for information:

“Dear Seiko, can you please confirm if the 4R35B has 23 or 24 jewels? Tech sheets say the “B” has 24 jewels, but many watches with a 4R35B signed rotor say 23 jewels. Thank you in advance for any clarification you can provide. -Caliber Corner”

Dear Customer,
We have inspected few watches with B movements, and they all state 23 jewels.
Thank you for your feedback, we are in process of correcting that information.
Kind Regards,
SWA

This confusion is further perpetuated due to the fact that the 4R35B is regarded as the “Seiko only” version of the SII NH35A which has 24 jewels.

Please comment below if your 4R35B powered watch has 23 or 24 jewels.

Accuracy Rating:

Seiko claims that the accuracy of caliber 4R35 is between +45 / -35 seconds per day. This rating is based on normal daily wear on the wrist in temperatures between 5 ºC and 35 ºC. When testing your watch for timekeeping, make sure it is fully wound.

Crown Position Functions:

0 (against the case): Clockwise = Manual Winding / Counterclockwise = Nothing
1 (pulled out one click): Clockwise = Nothing / Counterclockwise = Date setting
2 (pulled out two clicks): Time setting clockwise and counterclockwise

Stem Removal:

To remove the stem, make sure the crown is in position 0 or normal position (not date or time setting position). There is a lever with a small indentation for your tool. Gently press down while pulling the stem out. See official instructions below for more guidance:

Seiko Caliber 4r36 Stem Removal

Examples of Watches With This Movement:

Additional Resources:

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Seiko Caliber 4R35A Watch Movement | CaliberCorner.com
3 years ago

[…] Click here for the main Seiko caliber 4R35 post and to learn more about the differences between 4R35, 4R35A, and 4R35B. […]

Matt
Matt
3 years ago

The Seiko SRPC87 uses the 4R35B movement but contrary to the information provided here states that it’s 23 jewels.

Ide
Ide
3 years ago
Reply to  Caliber Corner

Yes, please do inform us the latest clarification from Seiko.
I bought a Seiko 5 Sports with 4R35B movement but it is 23 jewels instead of 24. Also, the date is at the 4.30 position instead of 3. Any explanation for this? Did I buy a genuine Seiko watch?

John
John
3 years ago
Reply to  Ide

I think you and I bought the same watch. I am concerned because the 23 jewels may not have hacking or the ability to be hand wound. Looking for help on this.

Tạ Xuân Trường
Tạ Xuân Trường
2 years ago
Reply to  Caliber Corner

So, If I have a Presage Seiko said in its back that: 4R35A , twenty four jewels. That watch is fake, isn’t it? Thank

Emiliano del Pozo
Emiliano del Pozo
1 year ago
Reply to  Matt

The mechanical movement has 24 jewels is 4R35 or NH35A.

John
John
3 years ago

where can I buy a 4r35b movement?

trackback
Seiko (SII) Caliber NH35A Watch Movement | CaliberCorner.com
3 years ago

[…] also important to note that the Seiko NH35A movement is basically an unbranded version of the Seiko caliber 4R35. for example, the NH36 is an unbranded version of the 4R36 (day + date) found in the Next […]

Dave
Dave
3 years ago

I recently bought an SRPC19K1 from the grey market, it has 4R35B, Twenty-Three Jewels, written on the rotor.

Tanuj Saxena
Tanuj Saxena
3 years ago

I am having an issue with my Seiko SRPB51 Samurai with 4r35 movement. I noticed that the second hand is not stopping even when I pull out the crown fully on the last position. Initially it, used to stop when the crown was pulled out fully. Its a new watch I have just bought it in June 2019.

Padi Fanboy
Padi Fanboy
3 years ago

My PADI auto has this movement with 23 jewels. I was wondering if there is a 24 jewels PADI?

Mike G
Mike G
3 years ago

Does anyone know the recommended turns per day (TPD) for this movement on a watch winder? Thanks in advance

Szosky
Szosky
2 years ago
Reply to  Mike G

30 rpm for 60 min.

Mike Garcia
Mike Garcia
2 years ago
Reply to  Szosky

I’ve been running 600 TPD clockwise (your 30 rpm for 60 mins suggests 720 TPD) for over a year and it has kept amazing time so far.

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3 years ago

[…] The Prospex line has been updated since the 2105 ad above, but you get the point: the dive watches are built like a submersible tank. Size-wise, we’re back up to 44m and 200m water resistance for the Japanese selection, relying on Seiko’s reliable but not astoundingly accurate Caliber 4R35. […]

José Maria Aguasca Ribot
José Maria Aguasca Ribot
2 years ago

En mi muñeca se mantiene en unos muy razonables + 8 / 9 segundos 24h.
Concretamente el 4R35

June
June
2 years ago

Can i replace 4r35 to eta2824?

Stephen
Stephen
2 years ago

Seiko 5 SRPB94 model, machine 4R35B. Comments is rapadly start and stop, some time totally stop. Per day 24hr 6 minutes slow. New watch purchased on 17/8/2019. Price. 110/- KD. Kuwai Dinar.one month also not work properly. Not satisfied with Seiko 5 automatic watch. Kindly advise to me.

John
John
2 years ago

I purchased a Seiko samurai September 2019 from official dealer. Watch kept perfect time,( with my radio controlled watch). After 2 weeks it started to gain about 6 seconds per day consistently. As I have several quartz watches I like accurate time, so I attempted to adjust the Seiko by moving the regulating arm on the balance wheel. The first attempt made it run slow by 3-5 seconds per day, so I nudged the regulating… Read more »

Rocco of Stay Sprung
Rocco of Stay Sprung
2 years ago

The B is def. 23 jewels I have a SRPC model open case back were it states 23 and this is a 2017 piece

andré kristiansen
andré kristiansen
1 year ago
Reply to  Caliber Corner

I have a Presage 3r35B and it states 24.

Brad Hoffner
Brad Hoffner
2 years ago

On a watch winder, how many TPD(Turns Per Day) for 4R35?

Kurt
Kurt
2 years ago
Reply to  Brad Hoffner

I set mine to 700.

Brad Hoffner
Brad Hoffner
2 years ago
Reply to  Kurt

Thank you!

trackback
Seiko Presage Cocktail Time SRPB41J1 – Beans & Bezels
2 years ago

[…] watch uses Seiko’s 4R35B movement, which I believe is the latest in the 4R35 movement family. I’m not a Seiko expert, […]

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1 year ago

[…] NH35 is made by Seiko Instruments Inc. It’s the same movement as the 4R35, but it doesn’t say Seiko on the […]

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1 year ago

[…] but should you buy the hype? With a 40mm steel case, rather slim proportions and featuring the Seiko caliber 4R35, the cocktail time is easy to wear for a wide range of […]

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1 year ago

[…] the SKX, so I figured a step above that would be a good place to start. The hacking and handwinding 4r35 movement seemed useful, and the design looked a lot more interesting than an skx to my eye, so I happily […]

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1 year ago

[…] diferencias importantes. Quizás la más destacada sea el cambio de calibre, pasando del 6R15 al 4R35. Este último no es un mal calibre y ofrece casi lo mismo que el 6R15, siendo meramente un poco […]

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1 year ago

[…] the 7/10), complimenting the classy nature of this dress inclined timepiece. While the venerable 4R35 movement remains, sapphire crystals are now included in this value packed proposition, making this bracket […]

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1 year ago

[…] an interesting option which for some maybe unwanted. In honesty, although it may be interesting the Seiko caliber 4R35 movement isn’t decorated so I would have preferred to have seen a solid case back with maybe a […]

Emiliano del Pozo
Emiliano del Pozo
1 year ago

I am reading here, in the box above “4R35,4R35A, 4R35B” have a lift angle of 53º. After this information in “Differences between 4R35A and 4R35B”, 4R35A –> lift angle 52º and 4R35B –> 53º, which is the correct information?

Emiliano del Pozo
Emiliano del Pozo
1 year ago

“The caliber 4R35 is basically a Seiko-only version of the NH35A”. I thought the original was 4R35A and NH35A was the same caliber for others assemblers.

ERIK
ERIK
1 year ago

My B model (4R35-01M0) has date at 6. Rotor indicates 23jewels.

Bear
Bear
1 year ago

I have a seiko sea turtle and the seiko srpd23 I think the seiko srpd23 is a handsome watch beautiful looks runs great.i dive for gold so the sea turtle is built for that,the Loomis markers are great they light up a room and is seen better while diving,great job seiko

Phil Power
Phil Power
1 year ago

Hi, I have a 4R35B movement which has twenty three jewels. I hope this is helpful.
Kind regards,
Phil

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[…] movement. I’ve covered this movement over a dozen times already, in all it’s different incantations, so I’ll just say that these are decent movements for the $200-400 price range. Beyond that, […]

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1 year ago

[…] builds their own movements, so one can say that they are “in-house” movements. The 4R35B with 21.600 VPH (3Hz) is featured in this […]

Nikodem
Nikodem
1 year ago

Hi Everybody, I have a question , does 4R35B has a “magic lever” ?

Thanks in advance for yours answers ?

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Seiko 4R Series Watch Movement | Caliber Corner
10 months ago

[…] 4R35 – Date (23J/24J) […]

Thom Kwasky
Thom Kwasky
10 months ago

I have an SRPE43 with this movement. Is the rotor wheel made of gold or another metal? Is it gold plated or painted?

Hovig's Supply House
Hovig's Supply House
8 months ago

We have several 4R35B movements, and they are all marked 23 jewels. The 4R36 movements are all marked 24 jewels.

Reallyzen
Reallyzen
7 months ago

I confirm the 35B has “23” written on the rotor, has hacking. While checking, I also noticed a serious blemish on the mechanism, a bridge that’s blackened at one end. Disappointed at the QC here.

Raul Tepace
Raul Tepace
5 months ago

Mine is 4R35B which has 23 jewels

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[…] movement and watch: One of their best sellers is the 4R35. It is notable as cost-effective. It is also known for having a three-hand automatic watch movement […]

walter baskerville
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3 months ago

SRPF79 Save the Ocean Dark Manta

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2 months ago

I have a Seiko NH35 in my Maratac LSA dive watch. When I first got it, the movement hadn’t been regulated well and was running at -13 to -15 S/D. After regulation in multiple positions, it’s running at -3 to -4 S/D. However, it runs at +/-0 to +1 if I let it lie dial up for at least 6 hours at night. It will gain back whatever was lost during the day, which is… Read more »

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[…] Seiko de la serie Presage cuenta con un movimiento automático Seiko 4R35 de 23 joyas con capacidad de cuerda manual. De igual manera, cuenta con una caja de acero […]

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[…] 4R35 […]

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Venus Caliber 178

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