MIYOTA 8215

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The Miyota 8215 is a reliable, inexpensive, 21-jewel automatic watch movement manufactured in Japan by Citizen's Miyota division. [1, 2, 3]

Key Specifications

Type: Mechanical Automatic (with manual hand-winding)
Frequency: 21,600 vibrations per hour (3 Hz / 6 beats per second)
Power Reserve: Approximately 42 hours
Accuracy: -20 to +40 seconds per day
Diameter & Thickness: 26.00 mm diameter and 5.67 mm thick
Complications: Central hours, minutes, sweeping seconds, and a date window (typically at 3 o'clock) [1, 2, 3, 4]

Pros and Cons

Pros: Highly durable, easy to service, widely available for watch modding, and acts as a tough entry-level workhorse.
Cons: Features an indirect-drive second hand that can visually stutter or pause slightly when the watch is jolted. Older versions do not feature hacking (stopping the second hand to set the time), though modern iterations may include a stop-second device. Its uni-directional winding rotor can also spin freely and feel a bit loud or "rattly" on the wrist

This movement has been built into a dive case.

100m water resistance.

Its OK for showering

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Very reliable.

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