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.
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:
Pull the crown to position 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.
Push the crown back to position 0
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.
The average replacement price at the time of this post was from $26.95 – $36.95. Try here.