Seiko Caliber 6N52 Watch Movement

Manufacturer	Seiko
Caliber Number	6N52, 6N52A
Movement Type	Quartz
Jewel Count	0
Frequency	32,768 Hz
Battery Cell	SR621SW / 364
Battery Life	3 years (36 months)
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	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.

This page is being edited.

Full caliber listing coming soon.

Some of the topics covered in this caliber listing:

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.