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The Miyota caliber 6S50 is a quartz chronograph watch movement. It is made in Japan and has 0 jewels.
Miyota claims the accuracy of this movement to be +/-20 seconds/month.
According to Miyota, the correct SR927W battery cell should last about 4 years. It’s important to note that running the chronograph means the watch is working harder and this reduces the battery life. It’s advised to only use the chronograph when you need it. If you are not going to wear your watch for a while and want to save the battery, pulling out the stem (aka hacking the movement) will reduce the battery consumption.
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 (time setting position).
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.
Press button B to advance the 1/20 second subdial.
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 $25 – $29.95. Buy it here.
Assembly Warning: Blowing the Big Date
The Miyota tech sheets have been updated to include a huge warning about not using a blower to clean dust unless the big double digit date is set to either 09, 19, or 29.
Interesting side note: it’s also interesting that this warning was written in English and Chinese, not Japanese even though the movement is made in Japan. Presumably this is because the official documentation exists in Japanese, but most likely it’s because the two main markets using this movement are the Chinesse factories that build most of the microbrands and the American brands that sell them.
Examples of watches with Miyota caliber 6S50
The Miyota 6S50 found in an AVI-8 Hawker Harrier II watch