Miyota Caliber 8218 Watch Movement

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Miyota Caliber 8218

BrandMiyota (Citizen)
Caliber Number8218
Base Caliber Miyota 8215
Movement TypeAutomatic
Lignes11 1/2”’
Diameter 26mm
Casing Diameter 25.6mm
Height5.67mm
Jewel 21
Vibrations Per Hour 21,600 bph
Power Reserve 40 hours
Lift Angle49 degrees
Stem065-212
Movement Holder 500-710
Hand Size 1.52mm / 1.0mm / 0.17mm
Anti-Shock System Parashock
Hacking Seconds? No
Hand-Winding? Yes
Hand Count 3
FunctionsCentral hours; central minutes; small seconds subdial between 4:00 and 5:00; date at 3:00
Country of ManufactureJapan
Known Models Reverie Sea-Spirit, SD-09 UFO Spacecraft, AVI-8 Spitfire 300 (Add your watch in the comments below)

The Miyota caliber 8218 is an automatic movement found in many microbrand watches. This caliber is part of the Miyota 8000 Series family of movements, specifically in the “Small Hands” category. It features a sweeping small seconds hand at 4:30, as well as a date at 3:00.

Some of the topics covered in this caliber listing:

  • Miyota 8218 vs 8245
  • Miyota 8218 vs 8219
  • Accuracy Rating
  • Power Reserve
  • Replacement Prices
  • Examples of watches with caliber 8218

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 Rating:

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.

Replacement Prices:

At the time of this post, replacement prices for the caliber 8218 were found online in the range of $40-50 USD.

Examples of watches with caliber 8218:

The example pictured below is from the crowdfunded SD-09 UFO Spacecraft watch.

Miyota Caliber 8218 Sd09

Below is a custom airplane rotor found in an AVI-8 Spitfire 300 watch powered by a Miyota 8218 movement.

Avi 8 Watches Airplane Rotor Miyota 82

Additional Resources:

  • Miyota caliber 8215

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