Seiko Caliber Y676
Seiko Caliber Y676

Seiko Caliber Y676

Manufacturer Seiko
Caliber Number Y676
Based On
7S26
Movement Type Automatic, self-winding mechanical
Diameter
27.4mm
Height
4.8mm thick
Jewels 21
Power Reserve
~41 hours
Beat Rate
21,600 bph
Lift Angle
53 degrees
Shock System Seiko Diashock
Regulator
Etachron
Rotor Winding Direction
Bi-directional (Magic Lever)
Hand-Windable? No
Functions Central hours; central minutes; central sweeping seconds; day/date calendar at 3:00
Hacking Seconds? No
Country of Manufacture Japan/Malaysia/Singapore?
Known Brands
(Add your watch to the comments below…)

The Seiko caliber Y676 is essentially the SII (Seiko Instruments Inc.) version of the widely known Seiko caliber 7S26 (no hacking, no manual-winding). There is not a lot of information available for the Y676, this is partly due to it being an older caliber which has now been discontinued. For more information on its counterpart, read the Seiko 7S26 caliber listing.

Y676 VS 7S26:

The calibre Y676 was made for watches outside of the main Seiko brand, such as Alba, Pulsar, Lorus, and J. Springs (aka Japan Springs) – all Seiko owned companies. If you have a watch with this movement, please share it in the comments below.

Similar to the cal. 7S26, there are lettered evolution variants of the Y676: Y676A, Y676B, and at least up to Y676C. It is not confirmed if the changes made in the 7S26 A/B/C correspond directly to the A/B/C in the Y676, but it’s likely safe to assume as much until the community finds evidence to the contrary.

Interesting note: The official instruction manual from Seiko combines information for calibers 7S25, 7S26, Y675, and Y676.

Country of Origin:

Many seller list watches with this movement as “Japan”. Although Seiko is based in Japan, it doesn’t mean their products are all made in Japan. Sometimes the Y676 is signed Japan (such as in some Seiko Onitsuka Tiger models) and sometimes there is no country of origin – similar to what SII/TMI is doing with the NH35A now. It’s unlikely that Seiko makes movements in Japan and not mark them as such. If you have a Y676 signed “Japan”, please add it below.

For what it’s worth, it does seem like newer versions of the Y676C tend to be signed with Japan on the rotor.

Y676 VS Y675:

There is a similar caliber Y675 with the main difference being that the Y676 is a day-date and the Y675 is a date only.

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Seikoholic
Seikoholic
1 year ago

I never understood why they make two of everything? Why not just use the 7S26 instead of making a different number Y676 for the same thing?

Der Dicke
Der Dicke
1 year ago
Reply to  Seikoholic

It is solely to mislead the consumers / watchlovers, it’s about ‘sending them into the soup of calibers’ regarding their products; people are purposely made confuse about this, because this way – in this case Seiko – they sell more products / calibers to different watch brands which use these calibers / movements.

richard
richard
1 year ago

they just made this caliber for a bunch of automatic watches named lorus here in holland.

16739866182201021713152729837455.jpg
richard
richard
1 year ago

its a y676c

16739876475138030447308627958147.jpg
North Joicey
North Joicey
1 year ago

This, I just bought on Amazon, 16/1/23 for £70 with this movement in. I noticed it doesn’t have a country of origin on it, only the TMI logo, but for the money, it’s a no-brainer, wear everyday watch.

Lorus Orange Front Y676C.jpg
Lorus Orange back Y676C.jpg
William Mendoza
William Mendoza
9 months ago
Reply to  North Joicey

Probably made in Malaysia, Bro, just like my Seiko Baby Monster srpb33k1 with 4r36 movement inside.

richard
richard
1 year ago

in front the lorus rl405bx-9 with y676 enginemotor

IMG20230115120851.jpg
Vincent
Vincent
10 months ago

J.Springs BEB588Q discontinued

IMG_20230530_150317_004_edit_420210992981190.jpg
IMG_20230530_145936.jpg
IMG_20230530_145903.jpg
William Mendoza
William Mendoza
9 months ago

I had an Alba Full Lume field watch with this movement inside. It kinda runs around a minute fast every week. Coming from Casio watches, it’s a bit of a bummer as my most inaccurate casio manifests the same time discrepancy after 3 months. But i guess they’re like apples and oranges. I’ve since upgraded to a Seiko Baby Monster with 4R36 inside. A half minute fast in maybe a month. Not too bad.

J. Henley
J. Henley
2 months ago

You perhaps meant to say ‘Seiko’ (because Alba’s Seiko Corp. now, @William Mendoza ? 😉

Brian Conley
Brian Conley
9 months ago

Pulsar PL4045X1 with Y676 SII movement. See pictures

7S26.jpg
1310.jpg
Rob
Rob
8 months ago

Elgin steel automatic (I believe it’s from the 90s) y676a signed Japan

16901129125898645793924949221774.jpg
16901129598577135010786073046369.jpg
Nick
Nick
3 months ago

I have a Lorus. It has an average of -5sec/day

Picture note. Same watch, different strap. Open case back.

IMG_20231226_142734
IMG_170317276140F
Al Dente
Member
3 months ago
Reply to  calibercorner

I have a Lorus RL447AX9. Average speed is -20 sec. per day which is, imho, too much. I’m planning to open the watch and let’s see what I can do. I would like to bring the movement up to +5 or +6 sec. per day.

RL447AX9-001
RL447AX9-002
Nick
Nick
3 months ago
Reply to  calibercorner

Al Dente. Please let us know how it goes.

J. Henley
J. Henley
2 months ago
Reply to  calibercorner

Hi there @Al Dente (nice nickname) :-D, it might be advisible to fully wind your watch with the “Seiko swing” for 1.5 minutes. Thén see how many hours it will get out of its hairspring until it runs out and stops. After about a month, you’ll be able to see its full potential in keeping the just time. If your watch with Seiko Y676C caliber runs ‘off’ at thát time, thén regulate it to fine-adjustement in +4-5 sec. per day. In 90% of cases, the breaking-in of the watch’s calibre will have brought it up to speed in around the… Read more »

Nick
Nick
24 days ago
Reply to  Nick

Update on my LORUS. It went from -5sec/d down to -9sec/d after a few days, but then I dropped it and send it to be repaired. Since then I wear an ultra cheap OUPAI with the Ingersoll520 which performs a lot better as far as accuracy goes. When I go back wearing the LORUS, I’ll do an other accuracy calculation and will let you know.

received_715702644068329
LORUS
LORUS
1 month ago

LORUS Classic RL457BX9
has Y676

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