Miyota Caliber 82S0 Watch Movement

Manufacturer	Miyota (Citizen)
Caliber Number	82S0
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	26mm
Height	5.67mm
Jewels	21
Vibrations Per Hour	21,600 bph
Lift Angle	49 degrees
Power Reserve	42+ hours
Rotor Winding Direction	Uni-directional (left)
Hand-Windable?	Yes
Manual Winding Direction	Clockwise
Anti-Shock System	Parashock
Stem	065-212
Plastic Movement Holder	500-710
Dial Screws	929-610
Hand Count	3
Hand Sizes	1.52mm / 1.0mm / 0.17mm
Functions	Central hours; central minutes; central sweeping seconds; skeletonized open balance wheel at 7:00
Hacking Seconds?	Yes and No (see below)
Country of Manufacture	Japan
Known Models	Advisor Ascent Mr. Skull, Orodeus OD-1 Time Odyssey, Bulova Aerojet, Nixon Spectra, TSAR Bomba (Add yours in the comments below…)

The Miyota caliber 82S0 (not 8250 or 82SO) is from the 8215/821A family but offers a skeletonized dial design. There is also a gilt (gold tone) version available.

Some of the topics covered in this caliber listing:

Accuracy:

Miyota claims that the caliber 82S0 offers accuracy of -20 ~ +40 seconds per day. This is measured within 10-60 minutes from a full wind via the crown. To fully wind the movement, turn the crown 40 times. The winding direction of the rotor is counterclockwise.

82S0 vs 82S5/82S7:

The caliber 82S0 has the following layout:

Central seconds
Open balance (skeletonized) at 7:00

The caliber 82S5 and 82S7 are based on the same movement, but the caliber 82S5 has small seconds instead of central seconds. The caliber 82S7 has small seconds instead of central seconds and also a 24 hour (can also be day/night) indicator at 9:00.

There is also an 82S6, but apparently it is only found in the Bulova A-15 flieger watch (ref: 96A245, released on 1/24/20). Despite this series of movements having an open balance (skeletonized) design, the Bulova has a solid dial with no view into the movement from the front of the watch.

Upgraded Hacking Seconds:

As of mid-2019, Miyota seems to have listened to the desires of the watch community and found a way to integrate a hacking mechanism (stop seconds device) into the 82S0. This means that the seconds hand will stop when the crown is pulled out. We have reached out to Miyota and will update this listing as soon as we have a reply with more information as to when they made this change. Keep in mind that although there are 82S0 movements popping up on the market, the current majority of 82S0 powered watches will be non-hacking. If you watch doesn’t hack, it doesn’t mean it’s broken.