Cc Bg 1920 1280
Seiko Caliber 6N52

Seiko Caliber 6N52

ManufacturerSeiko
Caliber Number6N52, 6N52A
Movement TypeQuartz
Jewel Count
0
Frequency
32,768 Hz
Battery Cell
SR621SW / 364
Battery Life3 years (36 months)
Stem
0351-332 (note: this is for the 6N42 and unconfirmed if it will work)
Hand Count
3 hands
FunctionsCentral hours; central minutes; central seconds; date at 3:00
Hacking Seconds?Yes
Country of ManufactureJapan
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.

This page is being edited.

Full caliber listing coming soon.

Accuracy Rating:

According to official Seiko documentation, they claim that the average monthly rate the 6N is less than +/- 15 seconds 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.

Examples of watches with this movement:

Additional Resources:
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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
1 year ago

what is the reference of the battery of this movement?

JANFR.
JANFR.
1 year ago

SR621SW=364

Ross
Ross
1 year ago

SUR317 & SUR371 also .)

Lucas Rego
Lucas Rego
1 year ago

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

Michael
Michael
8 months ago
Reply to  Lucas Rego

0 jewels as are most Japanese movements

braynerk
braynerk
1 year 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… Read more »

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
9 months 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,… Read more »

Storm Elkves
Storm Elkves
15 days 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?

Vlad
Vlad
1 year ago

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

Michael
Michael
8 months ago
Reply to  Vlad

364

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

[…] 6N52 […]

braynerk
braynerk
10 months ago

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

Steve
Steve
8 months ago

Band sizing instructions and watch value

Keith Mossey
Keith Mossey
7 months ago

Sur523

Matt
Matt
7 months 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
6 months ago

SUR373P1 uses this movement

JunC
JunC
4 months ago

Has anyone compared the 6N52 with the VH31?

Albert Keenok
Albert Keenok
4 months ago

Sur509 has this movement

Storm Elkves
Storm Elkves
15 days ago

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

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