Miyota Caliber 8215 Movement

Miyota Caliber 8215

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Brand Miyota (Citizen)
Caliber Number 8215
Movement Type Automatic
Diameter 11 1/2”’ (26mm)
Height 5.67mm (7.4 overall)
Jewels 21
Vibrations Per Hour
21,600 bph
Lift Angle
49 degrees
Shock System Parashock
Power Reserve
40 hours
Winding Direction
Counterclockwise (uni-directional)
Hacking No
Hand-Windable? Yes
Balance Staff 039-1020 (Citizen)
Stem 065-212, tap 10 (Citizen)
Hands Size
1.52mm / 1.0mm / 0.17mm
Functions Hours, minutes, central seconds, date calendar
Country of Manufacture Japan
Known Brands
Invicta, Vostok, Festina, Jacques Lemans, AVI-8 Flyboy Bronze (add more in the comments below)

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.

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.

Hesitating second hand?

Back in the year 2000, Rob Berkavicius (Rob B on TZ) and Paul Delury (Gumby on TZ) wrote this article addressing the concern of the second hand momentarily stopping when the watch is bumped on the side. The team set out to explore why it happens on the caliber 8215, whether it is acceptable, and if it affected timekeeping. It’s recommended that you check out the entire post here, but the main idea is:

The Miyota cal 8215 is an indirect sweep seconds design, very common in Swiss watches of even very high grades in the past. It allows for an elegantly simple design of the the watch, in this case the top plate encompasses both the time and winding trains. This view of the train, shows the sweep second pinion which passes through the center wheel, and is driven by the 3rd wheel.

Technically speaking:

…The brake spring, while effective at removing jitter, does not provide enough tension to hold the pinion steady under all conditions. So, when the watch is knocked, the pinion may be moved partially or all the way to the other side of the “slop”, and it may take a second or so for the movement to “catch up” again. Although this looks cosmetically unappealling, it makes no difference at all to the timekeeping of the watch. Increasing the tension of the brake spring must be done with great care, as too much tension will start to significantly affect the balance amplitude (from the extra friction in the train), and thus the timekeeping. And, this indeed is one of the reasons why “direct seconds” watch designs are now favored by watch manufacturers.

In conclusion:

The “Hesitating Second Hand”, observed on Invicta and other brands of watches is simply a characteristic of the “Indirect Seconds” type of movement design and in no way has any effect on the watch accuracy or timekeeping. If any watch company wanted to do something about it, the simplest, and really the only practical solution, would be to poise the second-hand. However, tens of millions of Indirect Seconds type watches of many different manufacture, in all grades from the cheapest pin pallet to high grade Swiss watches have been made in the past 50 years or so, and have been used with no problems at all. Indeed, it is hard to imagine how this characteristic could ever be observed during normal wear on the wrist, anyway. One can only assume it was claimed as a problem in an attempt to find fault in a watch which offers such excellent value for money as the Invictas do. So all you owners of Invictas, Omegas or any of the many, many other brands that use the same method for driving the second hand, there’s no need to worry about it!

Replacement Prices

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).

Click here to buy a replacement Miyota 8215 movement for your watch.

The photos below are from a Vostok N1 Rocket.

Examples of watches with caliber 8215

Extra Info:

Please share your experience with the Miyota caliber 8215 in the comments below…

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KeepTheTime.com
Guest

Also found in the Panzera Breuer 44

Morten
Guest
Morten

And in some Parnis watches as well.

Abe Tabish
Guest
Abe Tabish

This movement is in The Welder brand as well

Abe Tabish
Guest
Abe Tabish

It’s The Welder K24 3002 Model to be exact

Yankeexpress
Guest
Yankeexpress

Also found running older Gigandet, the Gavox Legacy, optional in Tiger-Concept and some Parnis.

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[…] Miyota caliber 8217 is from the 8215/821A family but offers an additional 24 hour hand […]

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[…] Full Miyota caliber 8215 specs and pics here […]

J Ferguson
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J Ferguson

Marc and sons MSD-039

Glauco
Guest
Glauco

Also used in the Bulova whatches

Griggon
Guest
Griggon

Seems my Casima, model CA-6913, is also on Miyota 8215. Pic on my Instagram account or tag casimawatch.

Jorge
Guest
Jorge

Also used in the Junkers g38 automatic date.

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[…] The 96A120 uses a Miyota automatic movement, although Bulova doesn’t seem too keen on letting us know exactly which model number it is. Manufactured in Japan, this particular movement uses 21 jewels, leading me to believe it is the 8215 or some other 8200-series movement. […]

Jorge Davila
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Jorge Davila

Is the price point for the 96A120 worth the movement?

Adam
Guest
Adam

Stuhrling Regatta 792 uses the Miyota 8215

IAN
Guest
IAN

Many Rotary automatics also use the 8215 movement.

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[…] have included that information. It sounds like Miyota 8215 does have hand winding, though: From: Miyota Caliber 8215 Watch Movement | CaliberCorner.com "Winding Direction Uni-directional (left)" From: https://en.wikipedia.org/wiki/Miyota_8215 […]

Jack
Guest
Jack

This movement equips also by Breil Manta Automatic M084 300m/1000ft

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[…] Miyota caliber 82S7 is from the 8215/821A family but offers a skeletonized dial design. There is also a gilt version […]

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[…] Miyota caliber 82S5 is from the 8215/821A family but offers a skeletonized dial design. There is also a gilt version […]

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[…] Miyota caliber 82S0 is from the 8215/821A family but offers a skeletonized dial design. There is also a gilt (gold tone) version […]

David Mceachern
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David Mceachern

This movement is also found in some Bernhardt brand watches. Binnacle line.

Abu Galib
Guest
Abu Galib

How is the accuracy durability and seviceability Miyota 8215. Hunting for a miyota 8 or 9 series tough/sports watch

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[…] black dial edition comes with a Japanese automatic movement which is possibly the Miyota 8215 but that information is not shared with us. Due to the price point I find it quite likely. If you […]

Mark Harris
Guest
Mark Harris

Hello, I use a spec ops watch from Praetorian Germany. It uses this caliber for its Signifier watches. Very similar too the Marathon Gsar. I have it in pvd, looks lovely, and really does perform admirably. I’ve found it keeps good time, no hacking which is a pain, but not the end of the world.

Joshua Book
Guest
Joshua Book

Also found in the Storm London AutoTec and Royal London Westminster.

Peter
Guest
Peter

used by Sternglas (Hamburg, Germany) for their Automatik watches

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[…] Posted by RSDA What's an "indirect seconds hand?" Here's a good explanation…Miyota Caliber 8215 Watch Movement | CaliberCorner.com Hours are like diamonds… Reply With […]

Ben
Guest
Ben

Also used in the Fiyta Photographer Skeleton.

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