Miyota caliber OS2O

Miyota Caliber 0S20

Last updated:
Miyota caliber OS2O 0s20
Example of a Miyota 0S20 in a Philip Stein Extreme Chronograph Watch
Manufacturer Miyota (Citizen)
Caliber Number 0S20 (sometimes typed as OS20)
Type Quartz
Replaces Caliber Unknown, please add in the comments below
Diameter 13.50”’ (30.80mm)
Height 5.1mm
Battery Cell Number SR927W (395/399)
Battery Life Approximately 5 years
Frequency 32,768Hz
Quartz Type Tuning fork type quartz crystal
Stem 065-441 (tap 10)
Hand Sizes 1.20/.70/.17 (small hands also .26)
Jewels 0
Functions Hours, minutes, central chronograph seconds, 60 minute counter, 24 hour hand, date
Country of Manufacture Japan
Known Models
Bulova chronograph, Philip Stein Extreme Chronograph (add yours to the comments below)

The Miyota caliber 0S20 is a quartz chronograph watch movement. You might also see other listings incorrectly refer to this movement at OS2O, but is should be zero-S-2-zero not O.

Accuracy

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

Resetting the chronograph to zero

If your chronograph hand is not resetting to 12:00 or “zero” position, then you can try the following steps:

  1. Pull the crown to position 2
  2. Press button A to advance the chronograph hand forward until it is lined up with 12:00. If you long-press A, the hand will move forward faster.
  3. Push the crown back to position 0

Miyota 0s20 Chronograph Reset
Note: if you push the crown back in to position 0 while the chronograph hand is still advancing forward, then it will stop the chronograph hand and recognize it as zero position. In this case, you will have to start over again.

Replacement prices

The average replacement price at the time of this post was from $26.95 – $36.95. Try here.

Examples of watches with Miyota caliber 0S20

More Info:

Citizen Miyota Caliber 0S20 aka OS20 quartz chronograph movement

Citizen Miyota Caliber 0S20 aka OS20 quartz chronograph movement

23
Leave a Reply

avatar
  Subscribe  
newest oldest most voted
Notify of
Arthur
Guest

What movement is used in the majority of Bulova Marine Star watches?
Unable to find answer anywhere on the internet.

Arthur
Guest

Is it the Miyota OS20 or the Miyota OS10 that is used in Invictas Corduba
With 2 marvelled registers chronograph? One register atop the other in
Center of dial?

Arthur
Guest

Auto correct. Marveled registered should have read Barreled Registers in
Center of the dial.

Michael
Guest
Michael

Is there an AC pad? Wondering if it is the (-) marking.

Aaron
Guest
Aaron

Is there any way to modify the OS20 movement do that it keeps time half as fast as normal?

So that it would work with a 24hr watch.

Jim
Guest
Jim

That is an interesting question Aaron. Can you explain more?

Martin
Guest
Martin

Hello Aaron,

yes, this can be accomplished by a hardware modification:
simply replace the 32768 Hz crystal with a 16384 Hz crystal
and the watch will run at half the original speed.

The downside of this modification is that the chrono speed will of course also be halved.

Regards
Martin

Herbert Gomes
Guest
Herbert Gomes

I would like to get the pointers to the 0S20 model. How do I do?

Jose Enrique Prades
Guest
Jose Enrique Prades

tengo un rolex que por dentro es igual que este de la imagen ,me estan diciendo que no es rolex autentico ,no me lo creo,si fuera imitacion no llevaria esta mecanica

Edwin
Guest
Edwin

Tu Rolex es falso amigo. Los relojes Rolex son suizos, fabrica sus propios calibres y ademas casi todos son automaticos a escepcion del Rolex Oyster Quartz

Wilson
Guest
Wilson

Para que sirven las indicaciones A1 A2 A3 A4 y los demas simbolos escritos en la parte de atras de los miyota os 20 demas calibres.

Wilson
Guest
Wilson

Para que sirven las indicaciones A1 A2 A3 A4 y los simbolos en la parte de atras de las maquinas miyota os20 y en otros calibres.

Tony
Guest

Where can I get a new face dial for the Miyota OS20 plus new Sub Dial Hands, what is the size of the Sub Dial hands
Many thanks & kind regards
Tony
Tony Arnold
arny@helios-electronics.com

Tony
Guest

Many thanks have ordered hands on Ebay
Kind Regards
Tony
Tony Arnold

Tyo
Guest
Tyo

Hi.
I have jorg gray 6500-11 with miyota os20 machine, i have problem to reset chronograph minutes hand on 60 position, when set crown at 2nd position then i pushing B button, the chronograph minutes hand back to 15 position, in anotherhand chronograph second hand back to 12 or zero position ..how to reset chronograph minutes hand?

Thank you

Ray
Guest
Ray
Luis Santos
Guest
Luis Santos

The german watch Dugena, model “Monza WR100”, also uses Miyota 0S20 caliber. It’s also marked on the steel back cover.

Instagram Feed Instagram Feed Instagram Feed Instagram Feed Instagram Feed Instagram Feed