Miyota Caliber 8218

Miyota Caliber 8218

Miyota Caliber 8218

Brand Miyota (Citizen)
Caliber Number 8218
Movement Type Automatic
Diameter 11 1/2”’ (26mm overall)
Height 5.67mm
Jewels 21
Vibrations Per Hour
21,600 bph
Shock System Parashock
Power Reserve
~42 hours
Lift Angle 49 degrees
Stem 065-212
Hand Size
1.52mm / 1.0mm / 0.17mm
Winding Direction
Counterclockwise (uni-directional)
Hacking No
Hand-Windable? Yes
Functions Hours, minutes, small seconds (at 4:00), date calendar
Country of Manufacture Japan
Known Brands
Reverie Sea-Spirit, SD-09 UFO Spacecraft (add yours in the comments below)

The Miyota caliber 8218 is an automatic movement found in many microbrand watches.

Miyota 8218 vs 8245

The caliber 8218 has a date at 3:00. The caliber 8245 is the same as the 8218 but without a date complication.

Miyota 8218 vs 8219

Similar to the caliber 8218, there is also a caliber 8219. They are essentially the same with exception to a 24 hour hand on the 2819 at 9:00.

Accuracy

Miyota states that the caliber 8218 keep accuracy within -20~+40 seconds/day, with a posture difference of under 50 seconds/day.

Power Reserve

The power reserve or running time when fully wound is about 42 hours. As for getting the full power reserve, Miyota says: The mainspring becomes fully wound by rotating the ratchet wheel 7.5 times or turning the crown 40 times.

The example pictured below is from the crowdfunded SD-09 UFO Spacecraft watch. Please talk about your experience with the Miyota caliber 8218 in the comments below.

Miyota Caliber 8218 Sd09

Tech Info

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Francis
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Francis

Is this movement hackable?

Robert
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Robert

I have a Seiko SNK809 and wonder if this is the movement inside.

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JUAN CARLOS
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JUAN CARLOS

The LACO JU-52, also has this caliber. What I do not know is if the caliber is refined o adjusted by Lack

Claudiu
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Claudiu

There are several watches which use the Miyota 8219 and remove the main hour hand, making it a 24-hour regulator watch. Some of these are: Sevenfriday Q2/01, CRJ Airspeed, Dufa Aalto, Apollo watches and at least 2 Parnis models.

Pete
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Pete

The Air Blue Papa Praesto uses this movement. Kind of ridiculous; I was just talking to my wife about movements and how they work and she wanted to see one. So I showed her the Papa Praesto’s since I’m wearing it. Anyways, as I’m showing her how an automatic works as opposed to handwinding, I found that this has handwinding, which I did not know after probably a year of owning it. I don’t recall it being advertised as having it or anything. Anyways stupid story, but, as I told her, I like this watch a little bit more knowing… Read more »

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Michael C Campbell
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Michael C Campbell

Just got a Spinnaker Croft with the 8218.

KeepTheTime.com
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Awesome, congrats on the new watch!

PaulS
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PaulS

Also found in French microbrand Axiom, several models f.i. «26» Bleu Horizon.
https://www.axiomwatches.fr/collection/26-bleu-horizon/

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