Seiko Caliber 6n52

Seiko Caliber 6N52

Seiko Caliber 6n52

Manufacturer Seiko Time Corp.
Caliber Number 6N52, 6N52A
Movement Type Quartz, battery-powered
Jewel Count
Zero (0)
Frequency
32,768 Hz
Battery Cell
SR621SW / 364
Battery Life 3 years (36 months)
Low Battery Indicator?
Unconfirmed (see comments section below)
Stem
0351-332 (note: this is for the 6N42 and unconfirmed if it will work)
Hand Count
3 hands
Functions Central hours; central minutes; central seconds; date at 3:00
Hacking Seconds? Yes
Country of Manufacture Made in Japan
Known Models
SUR307, SUR309, SUR311, SUR312, SUR314, SUR369, SUR373, SUR375, SUR377, SUR419, SUR421, SUR422, SUR457, SUR459, SUR460, SUR461, SUR468 (Add yours in the comments below…)

The Seiko caliber 6N52 is a 3-hander analog quartz movement. It is made in Japan and has no jewels. Timepieces with this movement feature a calendar date at 3:00.

Seiko Caliber 6n52a

Seiko Caliber 6n52 Quartz

Accuracy Rating:

According to official Seiko documentation, they claim that the average monthly rate the 6N is less than +/- 15 seconds per month under normal conditions (source). With regards to the 6N52, “normal” temperatures should be within the range of 5°C ~ 35°C (41°F ~ 95°F) for the best accuracy, however, the movement can still operate between -10C ~ 60C (14F ~ 140F).

6N52 VS 6N52A:

While you may see this movement mostly being referenced as 6N52, you may notice that the movement in your watch is engraved with 6N52A. The letter at the end of the caliber number is basically a version number. The main caliber number is 6N52 and A is the first version. At the time of this post, there is only one version. Therefore, “6N52” is the same as “6N52A”. So far, there is not a 6N52B or 6N52C.

6N52 VS 6N42:

There is a similar caliber 6N42 which shares many of the same specs as the 6N52 being discussed on this page. The 6N52 is considered an evolution of the 6N42, however, Caliber Corner has still not confirmed the main differences. Replacement 6N42 movements are available for sale from watch parts suppliers, whereas the 6N52 is not. Similarly, tech sheets for the 6N42 are available here, but the 6N52 technical communications have not yet been released.

6N52 vs 6N53:

There is also a similar Seiko caliber 6N53. The main difference between these two movements is that the 6N53 has a day/date at 3:00 and the 6N52 only has a date.

Changing the Battery:

The battery cell number in the calibre 6N52 is SR621SW / 364.

Below is a video of changing the battery in a similar cal. 6N42 movement.

Below is a macro image of the battery slot with the battery cell removed. Note that there is no need for an insulator tab.

Seiko Caliber 6n52 Battery Slot

Examples of watches with this movement:

The images on this page are of a cal. 6N52A found in this 140th Anniversary Limited Edition 140th Anniversary Sapphire model (ref: 6N52-00E0).

Seiko Caliber 6n52 00e0 Limited Edition

Caliber Commentary:

As originally posted on the @calibercorner Instagram page:

A lot of quartz movements still in use today are outdated, but the modern Seiko caliber 6N52 has a few design choices that standout compared to its Swiss (and even some entry level Miyota) counterparts.

Things to appreciate:

⚙️ The distance between the battery and the coil, means less likely to slip your tool against the cool. ⚙️ The protective insulator over the coil, means even if you do slip your tool, you probably won’t damage the coil!

⚙️ Easy press-in battery cell holder. No screws to lose; no battery straps to fly across the room; no friction arm 2mm away from an exposed coil ‍♂️

⚙️ No use of an insulator tab under the battery, just plastic that is already built into the movement.

Any watch technician can certainly appreciate coming across a layout like this when changing batteries all day! If you’re going for an affordable quartz, consider a watch with the 6N52A.⌚️

Here is an image of the red coil insulator/protector mentioned above:

Seiko Caliber 6n52 Coil

Additional Resources:
Caliber Corner is the world's most popular resource for watch movement pics, specs, mods and DIY repairs. Be sure to check out the member's forum and follow @calibercorner on Twitter, Instagram and YouTube (NOT Facebook). Join our mission to spread movement awareness! Login/Sign-up

Community Reviews & Questions:

  • Keep comments respectful and follow our community guidelines.
  • Keep comments on the topic of Seiko Caliber 6N52

For off topic or general watch questions, post in the Caliber Corner Forum.

guest

40 Comments
oldest
newest most voted
Inline Feedbacks
View all comments
alejandroanderson
alejandroanderson
2 years ago

I have been looking for this movement unsuccessfully. Any idea where I may get it?

Charles
Charles
1 year ago

Amazon & Ebay have them.

Hazo
Hazo
2 years ago

what is the reference of the battery of this movement?

JANFR.
JANFR.
2 years ago

SR621SW=364

Ross
Ross
2 years ago

SUR317 & SUR371 also .)

Lucas Rego
Lucas Rego
2 years ago

How many jewels would this quartz caliber have? I can’t find pictures on the internet.

Michael
Michael
1 year ago
Reply to  Lucas Rego

0 jewels as are most Japanese movements

braynerk
braynerk
2 years ago

espera de fotos y video de este calibre, se agradece el esfuerzo. saludos.

Charles
Charles
1 year ago

i have the SUR 421 and it has the 6N52 Calibre.

Charles
Charles
1 year ago

I am amazed with the accuracy of the 6N52 quartz movement. i recently ordered and received a SUR 421 watch from ebay for $100. it arrived on 22 Aug 2022 and by 2:30pm, i had the date & time set. Since then i have been logging the accuracy of the watch every day at 2:30PM. as of today, 8 full days later, the watch has not deviated one bit. it is 100% accurate to the split second.

Charles
Charles
1 year ago
Reply to  calibercorner

thank you for the prompt & courteous reply. i will continue to monitor daily the results on how my watch performs and will keep you updated after a few months.

Charles
Charles
1 year ago
Reply to  calibercorner

Ok here is an update on my Seiko SUR 421. received brand new on 22 Aug 2022 and did the initial time set that day. After one month, 21 Sep 2022, it was off by only one second, fast. On 16 Oct 2022, it was off by two seconds, fast so I reset the watch that day. Note this was the first and only time the watch has been reset since the initial setting. Today, 15 Feb 2023, four months later, the watch is off by two seconds exactly, fast. I will probably do a reset today and report back… Read more »

Storm Elkves
Storm Elkves
7 months ago
Reply to  Charles

You’re lucky. My experience is the opposite as it loses 6s per month which is terrible timekeeping for a quartz watch.

Brian
Brian
1 year ago

As a SUR375P1 owner. I found this 6N52 movement surprisingly accurate. Measured over 2 months, the watch is running -0.04s ~ +0.07s/day. Did not expected in this budget model at all. Great work Seiko!

Faisal
Faisal
1 year ago

Does this have a low battery indicator?

frifeal
frifeal
4 months ago
Reply to  calibercorner

how did you get this information, I found no documentation concerning this point on the caliber 6N52, no specific Seiko manual, it is the same for the 6N53 or the Hatrori VJ53.
Best regards

frifeal
frifeal
4 months ago
Reply to  calibercorner

I know the manual you cite, it is not specific to the 6N52 nor 6N53 but to all analog calibers. The subtitle is strangely INSTRUCTIONS FOR ANALOGUE QUARTZ AND MECHANICAL WATCHES hence my question. I am interested in the answer for the 6N53. Currently thanking you in advance. Best regards

Vlad
Vlad
1 year ago

What type of battery & replacement battery does 6N52 Seiko series watch need?

Michael
Michael
1 year ago
Reply to  Vlad

364

trackback
List of Seiko Watch Movements Watch Movement | Caliber Corner
1 year ago

[…] 6N52 […]

braynerk
braynerk
1 year ago

ando buscando fotos de este calibre por dentro, muchas de ante mano

Steve
Steve
1 year ago

Band sizing instructions and watch value

Keith Mossey
Keith Mossey
1 year ago

Sur523

Matt
Matt
1 year ago

Does anyone know the date disk size and if there’s any compatibility with the nh date disks. Would love to swap the date colour to match the dial.

Any help is appreciated, thanks.

md
md
1 year ago

SUR373P1 uses this movement

JunC
JunC
11 months ago

Has anyone compared the 6N52 with the VH31?

Albert Keenok
Albert Keenok
10 months ago

Sur509 has this movement

Storm Elkves
Storm Elkves
7 months ago

99% of the visitors to this page are looking for replacement battery size and there’s nothing. What a useless site.

Anton
Anton
5 months ago

Hi, any chance to update the pinion sizes for hour, minute and seconds hand? 🙂
Best
Anton

keepthetime
Admin
5 months ago
Reply to  Anton

Hi Anton, the watch has been sold already and is long gone. Will try to get another 6N52 to get a measurement of the hand sizes. In the meantime, you could try 1.2mm/.70mm/.17mm or 1.1mm/.65mm/0.20mm, but that is based on other Seiko quartz 3-hander movements and is not confirmed!

Leo Bellantoni
Leo Bellantoni
4 months ago

Does anyone know what size dial would work with this? Thanks

Howard Gillis
Howard Gillis
2 months ago

I have a 6N52-00D0. To change the battery, I have to take the back off. The video refers to the 6N52 but the back on mine does not have indentations. It is smooth. It looks like there is a very small indent on the side, not the back, for a lever to pry it off. So I cannot tell whether it is pried off or screwed off. I took it to the professional watch place where I bought the watch and they want $30 to change the battery. How can I get the back off?

Marriseri
Marriseri
2 months ago

I just charged the battery on my Seiko SUR309 and can confirm this caliber has not low battery indicator.

Basri
Basri
2 months ago

Only +4 seconds for 4 months. Great!!

Seagull Caliber St19

Join our mission to spread movement awareness!

Members Online

  • admin keepthetime

Recent Forum Posts

Trending Comments

j_holtslander
2

Miyota Caliber 2115

Found in a Kenneth Cole “Unlisted” brand watch.


2

Miyota Caliber 2035

The super 2035 is gold plated.


2

Miyota Caliber 2035

It is quite a decent movement IMHO. I have it in my Rdunae RA03 (US…


Zachmonoda
2

Miyota Caliber 2035

Why not just use another Seiko Y121? My cheap "George" Walmart $8.88 watch has one,…


1

Miyota Caliber 2035

I received this movement from aliexpress. Seems like this is the fake one that is…


Sponsors

40
0
Would love your thoughts, please comment.x
()
x