Seiko Sii Caliber Vk64a Mecaquartz

SII Hattori Caliber VK64A

Seiko Sii Caliber Vk64a Mecaquartz

ManufacturerSeiko Instruments Inc. / SII / Hattori / TMI
Caliber NumberVK64, VK64A
TypeQuartz (mecaquartz)
Lignes
13 1/2”’
Diameter
30.80mm x 29.10mm
Casing Diameter
29.00mm
Height5.10mm
Battery Cell Number394 (SR936SW)
Battery Life
~3 years
Jewels
0
FrequencyUnknown (please comment below)
Quartz TypeTuning fork type quartz crystal
Stem351177/tap 10 or 351892/tap 11
Hand Sizes1.50/.90/.32mm
FunctionsHours, minutes, central chronograph seconds, 1/5 seconds, 60 minute counter at 9:00, 24 hour indicator at 3:00, date at 6:00
Country of ManufactureJapan (assembled)
Known Models AVI-8 Flyboy, EMG Horizon Chrono, Autodromo Ford GT (list yours in the comments below…)

The Seiko Instruments (SII) caliber VK64A is part of the hybrid mechanical quartz (mecaquartz) movement line. It is a 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

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.

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:

The Seiko labeled caliber number for the VK64 is 6T64. 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.

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:


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Frederik Drost
Frederik Drost
2 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
2 years ago

Parnis Daytona Is fitted with a hybrid VKnn movement as well

Nathan Chisholm
Nathan Chisholm
1 year ago
Reply to  Erik van W

Parnis and Pagani both do!

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

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

Carlos Ferraro Chavez
Carlos Ferraro Chavez
1 year ago

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

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Brindemos Por Los Que Ya No Volverán – SaFonaGastroCrono
1 year 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
1 year ago

YEMA Rallygraf YMHF1572-BM

Michael
Michael
1 year ago

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

markos
markos
1 year ago

Undone Skipper Chronograph has it

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OSO Orbit Collection – Mirage – Beans & Bezels
1 year 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… Read more »

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Hemel HFT20 Night Ops – Beans & Bezels
1 year 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
1 year 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

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Reseña Invicta 35113: Celebremos La Vuelta Al Archivo - SaFonaGastroCrono
1 year 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 […]

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Trafford S.O.E Roadster – Beans & Bezels
1 year 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
1 year ago

Infared Genesis White

frank ouellette
frank ouellette
1 year ago

i have an infrared genesis with that caliber

Jay H.
Jay H.
1 year ago

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

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New Watch Alert: Esoteric, AP, FURLAN MARRI - The Truth About Watches
1 year 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
1 year ago

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

wijnsma
wijnsma
11 months ago

twco air controller chrono has this movement

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RZE Valour Review - A perfect watch ? | Hype & Style
8 months 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. […]

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RZE Valour - Test et avis | Hype & Style
8 months 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. […]

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Reseña Hoffman Racing 40 - SaFonaGastroCrono
8 months ago

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

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Monopusher Chronograph Watch Movement | Caliber Corner
6 months 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 […]

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Owner Review: Fossil Del Rey Bullhead Chronograph - FIFTH WRIST
6 months 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 […]

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In Review: Hager U-2 Dragonlady Chronograph | Wrist Watch Review
4 months 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
4 months ago

can that movement be adjusted?

Max George
Max George
2 months 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.

Jim
Jim
21 days ago

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

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Reseña RZE Valour - SaFonaGastroCrono
18 days 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 […]

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