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The Miyota caliber 8215 is a 21 jewel automatic movement, first introduced in 1977. It is made in Japan and is found in many new microbrand watches because it is easily obtainable, low cost, and considered an entry level workhorse movement.
This movement is also available in gold tone: 8215 Gilt.
Caliber 8215 VS 8205:
There is a caliber 8205 which is virtually the same movement as the caliber 8215 but with an additional day complication next to the date.
Accuracy & Power Reserve:
Miyota claims the caliber 8215 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.
Time and Calendar Setting:
You can hand wind the movement while the crown is in position 0. Pull the crown out one click to position 1 to set the time. Pull the crown out again to position 2 to set the date. Do not set the date while the time is between 9:00pm and 1:00am.
There are three calendar variations available from the factory:
8215-21A – Date window at 3:00. Square window. Datewheel: White background with black text.
8215-1AV – Date window at 3:00. Square window. Dateweel: Black background with white text. Special order with about 2 months lead time from Miyota.
8215-1TH – Date window at 6:00. Square or round window. Datewheel: White background with black text.
Replacement prices were found online in the $40-50 range for individual movements. When ordering wholesale, the caliber 8215 comes in packages of 300. They are available with a higher quality “fine finishing.” Although the plastic movement holder (part 500-710) is more common in affordable watches, this is interchangeable with a metal ring (502-008).