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Miyota caliber 821A

Miyota Caliber 821A

Miyota caliber 821A drawing

Brand Miyota (Citizen)
Caliber Number 821A
Base Caliber
Miyota 8215
Movement Type Automatic
Lignes
11.5”’
Diameter 26mm
Height 5.67mm
Jewels 21
Vibrations Per Hour
21,600 bph
Lift Angle
49 degrees
Shock System Parashock
Power Reserve
42 hours
Winding Direction
Uni-directional (counterclockwise)
Hacking? Yes and no (newer movements have hacking)
Hand-Windable?
Yes
Stem
065-212
Dial Screws
929-610
Movement Holder
500-710 (plastic), 502-008 (metal)
Hand Size
1.52mm / 1.00mm / 0.17mm
Functions Hours, minutes, central seconds, quick set date (at 3:00 or 6:00)
Country of Manufacture Japan
Known Brands
(add your watch in the comments below)

The Miyota caliber 821A is a self-winding automatic movement in the 82XX family. It has 21 jewels and is made in Japan.

821A-XXX Variants:

There are 3 variants of the caliber 821A from the factory. Everything is the same except for the calendar wheel. The dial on your watch may vary depending on the variation, this will be up to the watch manufacturer and the style of the watch. Please comment below to let us know what you watch model is and where the date is located on the dial.

  • 821A-43A – Date at 3:00, black text on a white background date wheel, square window shape.
  • 821A-43Z – Date at 6:00, black text on a white background date wheel, square or round window shape.
  • 821A-43K – Date at 3:00, white text on a black background date wheel, square window shape.

There is also a gilt version with the same caliber number. The gilt version has a gold tone finish.

821A VS 8215:

The 821A is based on the caliber 8215 which is very popular in the affordable automatic watches category. The main difference between the 821A and 8215 is that the 821A has a decorated finish and a cutout rotor instead of a solid half circle.

In Miyota’s own words, the 821A features:

Fine finishing with barrel bridge

When microbrands use the caliber 8215, they may use a solid caseback or customize the rotor with a sticker or other application. It’s more common to see 821A powered watches with an exhibition caseback as the 821A is considered to be more attractive thanks to the higher level of finishing.

Brands sometimes don’t even realize which version they are using and will sometimes incorrectly label an 821A as an 8215. This has caused some confusion in the community. To be sure, always look at the rotor.

8215/821A rotors/finishing compared:

Miyota 8215 Vs 821a Rotor Finishing Compared

Other Calibers:

There is also a caliber 820A with the main difference being that the 820A has a day/date complication, whereas the 821A only has the date option. Interesting note: The 820A is the decorated version of the caliber 8205, which is the day/date version of the 8215.

Accuracy & Power Reserve:

Miyota claims the caliber 821A has an accuracy rating of -20 ~ +40 seconds per day. This is only measured within 10 to 60 minutes from a full power reserve. To achieve full power reserve, hand-wind the crown 40 times. Power reserve or fully wound running time is about 42 hours.

Hesitating Seconds:

The Miyota 821A is one of the modern automatic movements that experiences a stuttering or hesitating second hand due to the indirect-drive system for running the central seconds. Learn all about it.

Upgraded Hacking Seconds:

As of mid-2019, Miyota seems to have listened to the desires of the watch community and found a way to integrate a hacking mechanism (stop seconds device) into the 821A. This means that the seconds hand will stop when the crown is pulled out. We have reached out to Miyota and will update this listing as soon as we have a reply with more information as to when they made this change. Keep in mind that although there are 821A movements popping up on the market, the current majority of 821A powered watches will be non-hacking. If you watch doesn’t hack, it doesn’t mean it’s broken.

Replacement Prices:

Replacement prices were found online in the $40-50 range for individual movements. Despite the higher level of finishing, the price is not too far from what you can expect when buying an individual caliber 821A. Although the plastic movement holder (part 500-710) is more common in affordable watches, this is interchangeable with a metal ring (502-008).

Please allow us to interrupt your gear turning and caliber learning to say thank you. Thank you for being here! Now, back to the movement..

When ordering wholesale from Miyota, the minimum unit order for the caliber 821A comes in packages of 100 with a lead time of around 2 months.

Miyota 821A Macro Gallery:

The photos are from a Detroit Watch Company “Pride of Detroit” watch.

Miyota caliber 821A

Examples of watches with the 821A:

Additional Resources:

Is the Miyota Caliber 821A any good? Share your opinions, experiences and watches below... Keep comments respectful and follow our community guidelines.

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Yankeexpress
Yankeexpress

These are good low beat automatics, robust and reliable. They are in new Gavox Legacy, and many older Gigandet, older Invicta

Gerald
Gerald

You seem to know movements. I bought an old Sea Dweller 40mm (date just). The previous guy opened it up and messed up the movement, with some of the components also missing. Dealer gave me a quote and I cannot afford the repair. What Miyota or ETA movement can I use as a replacement. The rest of the watch is still in fair condition and I would like to use it.

Ramsey
Ramsey

what did you end up doing with he sea-dweller? I love fixing up older models, lmk if you’d be interested in selling.

Mopar Driver
Mopar Driver

Better to wear the Rolex broken than put a Japanese movement inside. What is wrong with people!

Taylor Elkins
Taylor Elkins

The new MSTR nobel uses this movement

timo
timo

Also included in Ingersoll “Robert” IN8005.

Matt
Matt

I pretty sure the Fossil ME3100 uses this.

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YS
YS

You can’t go through COSC, as that will only allow Swiss made movement to go through the test and the watch will have to be swiss made.

Mazyar
Mazyar

Zeppelin LZ127 Graf Zeppelin

Kris
Kris

Why do these watch companies ruin watches by adding ugly plastic shields around the movements? If the case is too big for the movement it probably means something. And if the movement is too small at least make a metal spacer!

drut
drut

buy a real watch not that shit from diesel or calvin klein

Carlos Velazquez
Carlos Velazquez

Thank you very much for the information
Carlos 4/nov/17

Alex Mercer
Alex Mercer

Debert Bathyscaphe that I own (Blancpain Fifty-Fathom knockoff) has this movement. This movement is also known for its shutter/stutter second hand sweep movement.

Bern
Bern

I have a Junkers watch with this movement, and it is 2-3 minutes off every day.

Luciano E.
Luciano E.

The Ingersoll Scovill I05004 – and the other colour variations of this model – use this movement. I have it and it is very precise!

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Wolfgang
Wolfgang

For the author: The shock protection of this Miyota 821A movement is known as “Parashock”.

Regards,

Wolfgang.

Bernhard
Bernhard

The new Junkers J1 Sonderedition 2018 uses this caliber

Chad
Chad

The new Laco Augsburg and Aachen use this caliber as well

Mathew
Mathew

Have this movement in a rip curl Detroit been going strong for almost 5 years now never been opened

Anthony
Anthony

Rocking this movement in a Jack Mason. I’ve had no problems with it and it has stayed accurate for two years without adjustment.

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J.Lynn
J.Lynn

MVMT just announced this movement in a new automatic series of their fashion watches

Pat mat
Pat mat

Hey. I bought Zeppelin Lz 127 with this movement. I got it 3 days ago and First day it added 16 minutes and second day 15 minutes. Is it something temporary or will I have to send it back? And on top of that, it changes date in noon? How can I adjust date so it turns in midnight? I didn’t expect this with this brands. Some advices guys?

roger
roger

i have a new parnis “patek 03” with a myota 21 jewel automatic movement with date and hacking. can anyone tell me what model or movement reference this is.

Wolfgang
Wolfgang

After 8+ months of daily use I observe my particular example of the 821A as averaging +5 seconds a day.

I like these lower beat Miyota movements as they make the watch quite maintenance free and highly reliable compared to a high beat movement; however, they each have their place.

Hacking could be helpful – from the geekish and mechanical perspective within – although not likely as I need not match such precise timeframes within mere seconds; thus I run it numerous seconds fast so the minute always changes when the seconds hits 12.

The performance far exceeds the stated Miyota specifications.

Scott
Scott

I just ordered a watch with the 821a. Could you please tell me if it is also hand winding?

Wolfgang
Wolfgang

Indeed, it is handwinding.

Scott
Scott

Thank you for the info. S A M

Ed
Ed

This is also in the Baltic HMS 001

Louis
Louis

The Lip Nautic-Ski has this movement. Pretty steady +24/day. Winds well, no fuss and no frills.

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JeanL
JeanL

I have one in a Jack Mason F103, my day to day watch (currently)

J.H. Olguin
J.H. Olguin

I´ve just bought an Invicta Pro Diver 42mm model 30098 and it sports the 821A-43A. This pro diver is a relatively new model. One thing that surprised me about the movement is that it has Hacking. I don’t remember but I read somewhere that Miyota started shipping 821A movements with this new feature.

Christian
Christian

What is the 43A on the end of your movement number?

Hans Ludwig Obermann
Hans Ludwig Obermann

Trage eine ELYSEE Automatik Bronze Taucheruhr seit 07. Januar 2020 mit Miyota 821A (ohne Hacking) war noch nicht auf der Zeitwaage. Derzeit macht der Gang einen sehr guten Eindruck.