Seiko Caliber Y676
Seiko Caliber Y676

Seiko Caliber Y676

Caliber NumberY676
Based On
Movement TypeAutomatic, self-winding mechanical
4.8mm thick
Power Reserve
~41 hours
Beat Rate
21,600 bph
Lift Angle
53 degrees
Shock SystemSeiko Diashock
Rotor Winding Direction
Bi-directional (Magic Lever)
FunctionsCentral hours; central minutes; central sweeping seconds; day/date calendar at 3:00
Hacking Seconds?No
Country of ManufactureJapan/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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19 days 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
17 days 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.

15 days ago

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

15 days ago

its a y676c

North Joicey
North Joicey
14 days 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
3 days ago

in front the lorus rl405bx-9 with y676 enginemotor

Venus Caliber 178
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