Seiko Sii Caliber Vk64a Mecaquartz

SII Hattori Caliber VK64A

Seiko Sii Caliber Vk64a Mecaquartz

Manufacturer Seiko Instruments Inc. aka SII / Hattori / TMI
Caliber Number VK64, VK64A
Type Quartz (mecaquartz), chronograph
Lignes
13.5”’
Diameter
30.80mm x 29.10mm
Casing Diameter
29.00mm
Height 5.10mm
Battery Cell Number 394 (SR936SW)
Battery Life
~3 years
Jewels
0
Frequency 32,768Hz
Quartz Type Tuning fork type quartz crystal
Stem 351177 (tap 10) or 351892 (tap 11)
Hand Sizes 1.50mm / .90mm / .32mm
Functions Central hours; central minutes; central chronograph seconds; 1/5 seconds; 60 minute counter at 9:00; 24 hour indicator at 3:00; date at 6:00
Hacking Seconds?
Yes
Country of Manufacture Japan (assembled)
Known Models AVI-8 Flyboy, EMG Horizon Chrono, Autodromo Ford GT, Brew Method, Brew Retrograph, Yema Rallygraf,  (Add your watch in the comments below…)

The Seiko Instruments (SII) caliber VK64A is part of the hybrid mechanical quartz (mecaquartz) movement line. It is a bi-compax style chronograph movement that uses quartz technology for the main functions of the watch, and a mechanical module for operating the chronograph. Learn more here.

Seiko Sii Caliber Vk64a

VK64 VS VK61:

There is a similar bi-compax mechaquartz caliber VK61. The main difference is that the VK64 has the chronograph subdials located at 3:00 and 9:00, with a date at 6:00. The VK61 has chrono subdials at 12:00 and 6:00, with a date at 3:00. These calibers are mechanically and technically similar enough for Seiko to combine the tech guides for each into one document.

Accuracy Rating:

Seiko/Time Module states that the expected accuracy of this movement is less than +/- 20 seconds per month at normal temps.

Sweeping Chronograph Seconds:

As a mecaquartz type of movement, the chronograph second hand on the VK64 has a rather smooth sweeping motion, unlike most quartz chronographs that impulse with a ticking motion.

Battery Replacement:

The VK64 battery life is about 3 years with normal operation – not constantly operating the chronograph for example.

After installing a fresh battery cell, remember to reset the circuit by touching the AC terminal of the circuit block (look for an arrow labeled AC pointing to a hole) and the + side of the batter or battery strap (the metal part that is holding the battery in) with your tweezers.

Replacement Prices:

At the time of this post, replacement prices for this movement were found online in the range of $17.95 to $34.95.

TMI/SII/Hattori:

You might find this caliber VK64 listed as being produced by SII aka Hattori aka TMI (Time Module Inc) aka Seiko Instruments Inc. Learn more about the different names here. Other calibers with the same base movement are VK61, VK63, VK67, VK68, VK73, and VK83.

Update: This caliber listing originally had the line “The Seiko labeled caliber number for the VK64 is 6T64.” This is incorrect as Seiko never ended up releasing a 6T64. There is a 6T63 which appears to be a tri-compax version of the VK64 – with a similar 60 minutes chronograph subdial at 9:00, 24 hour indicator at 3:00, and a date. The main differences between the layout of the 6T63 and the VK64 is that the 6T63 also has a small running seconds subdial at 6:00 and a date positioned at 4:30 (rather than 6:00 on the VK64). As of this update, Seiko does not have a 6T64, nor do they seem to have any bi-compax style watches based on the 6T caliber. In the future, if they release a 6T based model with a similar layout to the VK64, it will likely be called the 6T64 and this post will be updated accordingly.

Examples of watches with caliber VK64:

The watch below is an AVI-8 Flyboy with a VK64A inside.

Seiko Sii Caliber Vk64a Wide

Additional Resources:

You are reading Caliber Corner, the world's most popular resource for watch movement pics, specs, mods and DIY repairs. Follow @calibercorner on Twitter, Instagram but NOT Facebook. Subscribe on YouTube. Join our mission to spread movement awareness!

Join the discussion on SII Hattori Caliber VK64A?

  • Keep comments respectful and follow our community guidelines.
  • Keep comments on the topic of SII Hattori Caliber VK64A

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

guest

43 Comments
oldest
newest most voted
Inline Feedbacks
View all comments
Frederik Drost
Frederik Drost
4 years ago

The new Vintro Lemans 52 has one in it, at that watch looks great and feels like an auto !

Erik van W
Erik van W
4 years ago

Parnis Daytona Is fitted with a hybrid VKnn movement as well

Nathan Chisholm
Nathan Chisholm
3 years ago
Reply to  Erik van W

Parnis and Pagani both do!

trackback
موتور ساعت مچی مکا کوارتز - وبلاگ ساعت ایراتک
3 years ago

[…] از معروفترین موتورهای سیکو مدل جدید Seiko Instrument HATTORI VK64A […]

Carlos Ferraro Chavez
Carlos Ferraro Chavez
3 years ago

Hagar Dragon Lady watch that honors the U2 pilots has one.

trackback
Brindemos Por Los Que Ya No Volverán – SaFonaGastroCrono
3 years ago

[…] “Sumo”, o el SW200-1 suizo. Para el cronógrafo, estaba disponible la opción del meca-quartz VK64 híbrido se SEIKO o el SW510 automático suizo, un fiel sucesor de la serie ETA 7750. Este […]

Bernardo de Carvalho
Bernardo de Carvalho
3 years ago

YEMA Rallygraf YMHF1572-BM

Michael
Michael
3 years ago

Straton Curve uses the VK64. Thanks for link to Seiko manual. Battery install and reset instructions very welcome.

markos
markos
3 years ago

Undone Skipper Chronograph has it

trackback
OSO Orbit Collection – Mirage – Beans & Bezels
3 years ago

[…] OSO is a new microbrand based in Singapore, and they’re dipping their toes into this highly competitive market with a meca-quartz equipped chronograph watch that appears to be inspired by the early decades of the Space Age. This is the Orbit Collection, and is a line-up of vintage inspired chronographs that do actually look the part for an aerospace inspired chronograph. I’m not sure what OSO stands for, but I’ll take a guess and say that it was heavily inspired by the Orbiting Solar Observatory (OSO) program of the 60s. […]

trackback
Hemel HFT20 Night Ops – Beans & Bezels
3 years ago

[…] watch uses a Seiko VK64, a hybrid meca-quartz movement. If you don’t already know, I’m a fan of this movement […]

Nathan Chisholm
Nathan Chisholm
3 years ago

So the battery lasts about three years! What about if you use the chronograph now and then does it use a lot more juice? Thanks

10tocantes
10tocantes
2 months ago
Reply to  calibercorner

Chronograph stops after 60mins.

trackback
Reseña Invicta 35113: Celebremos La Vuelta Al Archivo - SaFonaGastroCrono
3 years ago

[…] destacable se refiere al movimiento. La reedición emplea un calibre de cuarzo híbrido, el mecaquartz VK64 de SEIKO que emplean muchísimos otros fabricantes. El reloj original equipaba el calibre Landeron […]

trackback
Trafford S.O.E Roadster – Beans & Bezels
3 years ago

[…] movements for affordable chronograph watches. So I was pleased to hear that this watch uses a Seiko VK64 meca-quartz movement, with a sweeping central chronograph hand and no ticking seconds hand. With […]

Anorak
Anorak
2 years ago

Infared Genesis White

frank ouellette
frank ouellette
2 years ago

i have an infrared genesis with that caliber

Jay H.
Jay H.
2 years ago

The Infrared Genisis has this movement. Thanks for further information on it.

trackback
New Watch Alert: Esoteric, AP, FURLAN MARRI - The Truth About Watches
2 years ago

[…] Piguet Selfwinding Chronograph look overwrought. And wouldn’t you really rather have a Seiko VK64 meca-quartz-powered timekeeper rather than AP’s rickety old Code 11.59 engine? No? Which […]

Luciano7
Luciano7
2 years ago

Why does one need to reset the circuit please? It is the first time I find out this important info…

walter
walter
8 months ago
Reply to  Luciano7

casio watches have it
AC contact reset

GreatArtiste
Member
27 days ago
Reply to  walter

But why does it require a reset? A Casio movement or the Seiko movement?

wijnsma
wijnsma
2 years ago

twco air controller chrono has this movement

trackback
RZE Valour Review - A perfect watch ? | Hype & Style
2 years ago

[…] The battery will last around 3 years with normal use and it’s accuracy is around -+ 20 seconds a month. Read more about the VK64 Seiko movement here. […]

trackback
RZE Valour - Test et avis | Hype & Style
2 years ago

[…] La batterie durera environ 3 ans avec une utilisation normale et sa précision est d’environ -+ 20 secondes par mois. En savoir plus sur le mouvement VK64 Seiko ici. […]

trackback
Reseña Hoffman Racing 40 - SaFonaGastroCrono
2 years ago

[…] versión no “mecánica” de este reloj equipa el calibre VK64 meca-quartz de SEIKO. Es un calibre de cuarzo “híbrido”, combinando la precisión […]

trackback
Monopusher Chronograph Watch Movement | Caliber Corner
2 years ago

[…] above the crown and one below the crown. For example, whether on the automatic caliber 7750 or the quartz VK64, you will press the top button to start and stop the chronograph timing mechanism, then press the […]

trackback
Owner Review: Fossil Del Rey Bullhead Chronograph - FIFTH WRIST
2 years ago

[…] watch bears the Seiko VK64 Mecha Quartz and has a 43mm steel case, 22mm width lugs, 13mm thickness and 10 ATM water resistance. This model […]

trackback
In Review: Hager U-2 Dragonlady Chronograph | Wrist Watch Review
2 years ago

[…] to power the Hager U-2 Dragonlady is a movement we’re well-familiar with here at WWR, the Seiko VK64 Hybrid Chronograph movement. While the quartz handles the heavy lifting, there’s a mechanical module as well. This allows […]

Oliver
Oliver
2 years ago

can that movement be adjusted?

Max George
Max George
1 year ago

Hi…please help me understand why is it that CASIO watches have batteries that last 10 years at least but the Seiko batteries are only 2 to 3 years ? Thank you.

doidge0@hotmail.com
doidge0@hotmail.com
6 months ago
Reply to  Max George

My first adult sized watch had a Miyota 10 year 3 hand date with alkaline button cell, when I had to replace it when I was 19 I could only find a Sony one in the store that was about 1mm thicker but it fit, it’s been ticking for over 12 years now, I never buy battery brands for watches or from watch brands as they are just renamed I allways use a certain brand but I forgot. Miyota that has access to citizen VHP, eco drive and Bulova hi beat qartz and long lasting alkaline cell could have a… Read more »

Jim
Jim
1 year ago

I just ordered a Dan Henry 1937 that uses this movement.

trackback
Reseña RZE Valour - SaFonaGastroCrono
1 year ago

[…] modelo que utiliza un movimiento de cuarzo. Este modelo está equipado con el calibre de cuarzo Seiko VK64 Mecaquartz, que muestra una escala militar de 24 horas en el subregistro de la derecha y un contador de 60 […]

AG
AG
1 year ago

Brew Retrograph uses this

Grindaur
Grindaur
1 year ago

Hoglund Sons Mark I Meca-Quartz

khursheed anwer
khursheed anwer
1 year ago

how many micro amp cunsume per sec.

Anciola 25
Anciola 25
1 year ago

I was wondering if this vk64 it’s interchangeable with a miyota 0s21.
I have a watch with that movement and I want to upgrade it with a mecaquartz.

Mohammed patel
Mohammed patel
8 months ago

In Seiko VK64A i serviced very well but my hacking second chronograph is not working by pressing
Watch is working perfectly
But 1 hour hacking second is not working pls give some tip what is the issue

10tocantes
10tocantes
2 months ago
Reply to  Mohammed patel

No small seconds counter or regular second hand on this movement. Not sure what you mean by “hacking second chronograph” or “1 hour hacking second”.

You can:
a) start and suspend/stop the chrono by pressing push button at 2
b) reset chrono at any time (no need to suspend/stop chrono) by pressing push button at 4
That’s about it. Chrono automatically stops after 60mins.

Richard Broman
Richard Broman
7 months ago

For this movement to fit a dial, what would be the cc distance between the holes of the subdials?

khursheed
khursheed
1 month ago

where parts awail in india?

Seagull Caliber St19

Join our mission to spread movement awareness!

Members Online

  • admin keepthetime val151

Recent Forum Posts

Trending Comments

4

Seiko Caliber 7S26

There reallt ís a "definite" and "safe" answer to this question - that'll serve for…


admin
4

Sellita Caliber SW330-2

Glad you got it all sorted out. Yes, it can be quite confusing sometimes. Really…


4

Sellita Caliber SW330-2

Hahaha, your right I was looking at the eBay listing, sorry for the accusation that…


3

Poljot Caliber 2416 “Kosmos”

You can just push the stem with a slightly firm push when it's at the…


3

Seiko Caliber 7S26

Which serves as the second hand pointer: the sharp edged-point or the ball-end of the…


Sponsors

43
0
Would love your thoughts, please comment.x
()
x