Miyota Caliber 0S21 Quartz Watch Movement

Miyota Caliber 0S21

Quartz
·24 Comments·

Miyota Caliber 0S21 Quartz Watch Movement

ManufacturerMiyota (Citizen)
Caliber Number0S21 aka OS21
TypeQuartz
Replaces CaliberCitizen 0510
Diameter13.50”’ (30.80mm)
Height
5.10mm
Battery Cell NumberSR927W
Frequency32,768Hz
Quartz TypeTuning fork type quartz crystal
Stem065-453
Hand Sizes120/80/18
Jewels0
FunctionsHours, minutes, central chronograph seconds, 60 minute counter, 24 hour hand, date
Country of ManufactureJapan
Known Models
REC, Philip Stein Active Chronograph

The Miyota caliber OS21 is a quartz watch movement with zero jewels. It is made in Japan.

Accuracy Rating

Miyota states the accuracy of this movement to be +/-20 seconds/month.

Additional Resources:

Watches with the Miyota 0S21

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24 Comments
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ewr
ewr
8 years ago

Why did you white the battery?

1
Reply
admin
Author
calibercorner
4 years ago
Reply to  ewr

That is the white plastic movement holder. It was designed to cover the battery in this watch. There are some that do not cover the battery.

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Dicey
Dicey
3 years ago
Reply to  calibercorner

So how would you replace the battery with that plastic cover on it like that?

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Todd
Todd
2 years ago
Reply to  Dicey

The plastic cover pops off. It’s part of the movement retainer to hold it in the case, but has an arm attached to it that also covers the battery. The whole plastic surround just pops right off, and then you can get the battery out.

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Marius
Marius
7 years ago

Is there any chance I can order this mechanism?

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Archie Burton
Archie Burton
7 years ago

Hi I am looking for a set of hands for a Miyota OS21 movement, they would not seem to be standard hands and sit down through the dial. Can you help? I have a picture of the actual hands

1
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News: Dugena Dakota Chronograph - Retro-Design zum moderaten Preis - zeigr.com
6 years ago

[…] bekannten Uhrenmarken – nicht nur bei Citizen. In der Dugena Dakota arbeitet übrigens ein Miyota OS21. Alles in allem kann man also sagen, dass man hier vernünftige Qualität zu einem vernünftigen […]

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Retro-Uhren unter 200 Euro: Dugena Dakota & Kemora - zeigr.com
6 years ago

[…] lag immer leicht neben der Minuten-/Sekunden-Markierung. Und was wahrscheinlich mit dem Werk (Miyota OS21) zusammenhängt: Beim Starten der Stoppuhr „klickt“ der Drücker, beim Stoppen […]

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Are Miyota (Citizen) OS20 Movements Swappable with Seiko VK63 Mecaquartz?
5 years ago

[…] interesting, I was going by Caliber, which apparently incorrectly shows they are the same size?Miyota Caliber 0S21 Watch Movement | CaliberCorner.comHattori SII Caliber VK63 Watch Movement | CaliberCorner.com So it seems they are not both 0.80mm […]

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Christopher Darway
Christopher Darway
5 years ago

Looking for 0S10 caliber for Boccia Do you still have these in stock?

0
Reply
admin
Author
calibercorner
5 years ago
Reply to  Christopher Darway

Hi Christopher, here is the official post for the Miyota caliber OS10. As for a replacement, you can try here: http://calibercorner.com/product/miyota-0s10-movement/

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Lokman
Lokman
4 years ago

Is the OS21 Chrono movement considered as mecha quartz? I.e with sweeping chrono hand movement

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Evil
Evil
4 years ago

I just bought an obvious fake hubot big bang with the miyota 0s21.
One day old and working very nicely

1593755032612965550401926763987.jpg
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15937559117464187919664191869734.jpg
-2
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New Watch Alert: 8/28/2020 - The Truth About Watches
4 years ago

[…] you can guess from the price, it holsters a quartz movement: the Miyota 0S21. The accuracy’s more-than-merely-adequate  (+/-20 seconds per month) there’s lume in […]

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Mirko
Mirko
4 years ago

Che tipo di batteria va montata?

0
Reply
admin
Author
calibercorner
4 years ago
Reply to  Mirko

Please see “Battery Cell Number” in the specs chart above 🙂

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Craig Johnson
Craig Johnson
3 years ago

Used by TRIWA NEVIL

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1609106400277736245843984648306.jpg
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Dicey
Dicey
3 years ago
Reply to  Craig Johnson

how did you get the white plastic bit off of this? I have a NEVIL too but mine has a white plastic cover

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Watchelper
Watchelper
3 years ago
Reply to  Dicey

The picture you show doesn’t have a white plastic cover…

0
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⌚️ Los relojes Briston puestos a prueba - Reloj.Watch ⌚ - 1 /julio /2021
3 years ago

[…] fuente de alimentación de este reloj es Movimiento de cuarzo Miyota OS21. Miyota son propiedad de Citizen, son uno de los mayor fabricante de movimientos de relojes en el […]

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Miyota Watch Movements (List) Watch Movement | Caliber Corner
2 years ago

[…] 0S21 […]

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Rodrigo
Rodrigo
6 months ago

Hi, is it possible to reset the chronograph minute hand to the 60 position? I have followed the procedure to reset the second hand to 12 o’clock, and it works, but the chronograph minute hand doesn’t move back to the 60 mark, when I press the B button. It seems it got stuck in the 10 minute mark, and it keeps returning to that point when I press the B button. Is there a procedure to reset the chrono minute hand? The manual only mentions a procedure to reset the second hand. Thanks a lot! Regards

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Ges
Ges
5 months ago
Reply to  Rodrigo

Hi, I struggled with that on a OS21 movement. After resetting the second hand the chrono minute hand had moved on slightly and I couldn’t reset it. I couldn’t find any info about it. However after persisting with different button pressing sequences I found it, and it’s simple but slow. Pull the stem out to position 2, same as for setting the second hand and simply press top button A and bottom button B alternately repeatedly. You will notice that the chrono minute hand moves a tiny amount each time then push in the stem. Be careful not to overshoot… Read more »

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Rodrigo
Rodrigo
5 months ago
Reply to  Ges

Hi, thanks a lot for the advice! Unfortunately, I cannot try the procedure, as I sold the watch! But it’s good to know how to do it. I really appreciate your help, anyway! Thanks for taking the time to reply. Cheers.

0
Reply
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