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The Miyota 8215 is a Japanese automatic wristwatch movement that is used by many watch makers. Miyota is part of the Citizen group of companies. Most watch makers do not make their own movements, but rather use standard watch movements manufactured by specialized companies.
The Miyota 8215 is a non-hacking twenty-one 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). The movement has a 49 degree lift angle.
Miyota 8215 movement in an Invicta 8926.