Friday, September 4, 2015

Movement: The Miyota 8205/8215 automatic

The Miyota 8215 (and its other variants such as the 8205) is a Japanese automatic wristwatch movement that is used by many watch makers. Miyota is part of the Citizen group of companies.

The Miyota 8215 is a non-hacking twenty-one (21) jewel three-hand with date movement with a uni-directional winding system (left rotation) with an accuracy of -20 to +40 seconds per day, and a power reserve of over 40 hours. The diameter of the movement is 26 mm and the thickness is 5.67 mm. It beats at 21,600 BPH or 3 Hz (6 half-cycles per second).

Below are some technical information useful for the understanding of the movement.

My watches that uses the movement (or its variants) are:
  1. MWF-Gruppo Gamma LE Watch
  2. Citizen Promaster Autozilla 1000m Titanium Divers Watch NH6930-09F (NH6931-06E);
  3. Citizen NY0040 200m Promaster Diver; and
  4. Citizen Automatic NY602151E Divers' Watch 

I have not had any problems with the mechanism throughout the years. From a practical point of view, the accuracy is more then sufficient for normal timekeeping duties although some may argue its 'lack' of accuracy compared to other movements from Switzerland and Japan.

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