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Citizen Miyota 8215 Automatic Movement 21 Jewels 21600 Bph

The Citizen Miyota 8215 is a robust automatic movement manufactured by Citizen Miyota in Japan for a few decades now, having had its debut in 1977.

It is a non adjusted 21 jewels movement beating at 21600 bph or 3Hz (6 half-cycles per second).

Its seconds hand are powered via a indirect drive which means that the Miyota 8215 automatic movement does not hack its seconds hand when setting time and the seconds hand may stutter if watch movement is subject to a harsh move.

Miyota 8215 Automatic Movement

Miyota 8215 Automatic Movement

However the indirect seconds hand drive does not affect the accuracy or durability of the watch movement.

Citizen Miyota has developed in 1956 a proprietary shock resistance technology called parashock used till this day in many of their movements as in the Miyota 8215.

The auto winding mechanism of the Miyota 8215 is unidirectional and charges the spring barrel when rotor moves counter clockwise (also indicated in engraved arrow in rotor).

The movement has a power reserve of about 42 hours and its daily accuracy is of about -20 to +40 seconds per day. The date setting mechanism also has a quick set mode as found in majority of modern mechanical watch movements. The hands size of the Miyota 8215 movement are 170 / 100 / 15.2.

Citizen Miyota 8215 Technical Drawing:

Citizen Miyota 8215 Automatic Movement Technical Drawing

Citizen Miyota 8215 Automatic Movement Technical Drawing

Citizen Miyota 8215 Technical Details:

Diameter 26.00 mm
Height 5.67 mm
Type of movement Automatic movement
Date Wheel Yes (usual setup – date wheel at 3 o’clock with white disc, black font)
Number of jewels 21
Power Reserve Approximately 42 hours
BPH (Frequency per Hour) 21 600 bph or 3Hz
Hacking Seconds No
Hands Size 170 / 100 / 15.2
Shock Absorver Parashock
Balance Staff Citizen 039-1020
balance with hairspring
Stem Citizen 065-212
By |2013-10-20T21:07:47+00:00October 20th, 2013|Categories: Watch Movements|Tags: , , , , |0 Comments

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