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
1 year 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
1 year ago

Parnis Daytona Is fitted with a hybrid VKnn movement as well

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

Parnis and Pagani both do!

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موتور ساعت مچی مکا کوارتز - وبلاگ ساعت ایراتک
10 months ago

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

Carlos Ferraro Chavez
Carlos Ferraro Chavez
8 months ago

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

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Brindemos Por Los Que Ya No Volverán – SaFonaGastroCrono
5 months 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
5 months ago

YEMA Rallygraf YMHF1572-BM

Michael
Michael
4 months ago

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

markos
markos
3 months ago

Undone Skipper Chronograph has it

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OSO Orbit Collection – Mirage – Beans & Bezels
2 months 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
2 months 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 month 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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