Miyota Caliber 9100 Watch Movement

Manufacturer	Miyota
Caliber Number	9100
Movement Type	Automatic, self-winding mechanical
Lignes	13.5”’
Diameter	30.2mm
Height	5.52mm
Jewels	26
Vibrations Per Hour	28,800 bph (4Hz)
Lift Angle	51 degrees
Power Reserve	40 hours
Anti-Shock System	Parashock
Winding Direction	Uni-directional (clockwise)
Hand Windable?	Yes
Stem	065-A05 (tap 10)
Plastic Movement Holder	500-002
Dial Screws	924-752
Hands Count	7
Hand Sizes	1.52mm / 1.0mm / 0.17mm
Hacking Seconds?	Yes
Functions	Central hours; central minutes; central sweeping seconds; 24 hour subdial; day subdial; month subdial; date window at 4:30; power reserve indicator at 12:00
Country of Manufacture	Japan
Known Models	Detomaso Forza XXL, TW Steel CEO Tech, too many to list (Add yours in the comments below…)

The Miyota caliber 9100 is from the 9100 family with other calibers based off of this one. Miyota is owned by Citizen Watch.

Some of the topics covered in this caliber listing:

Miyota 9100 Family:

9100 – Hours, minutes, central sweep seconds, 24 hour subdial at 6:00, day of the week subdial at 9:00, month subdial at 3:00 (set with the pusher at 2:00), date window at 5:00, power reserve indicator at 12:00
9110 – Hours, minutes, central sweep seconds, 24 hour subdial at 6:00, day of the week subdial at 9:00, date window at 3:00, power reserve indicator at 12:00
9120 – Hours, minutes, central sweep seconds, 24 hour subdial at 6:00, day of the week subdial at 9:00, month subdial at 3:00 (set with the pusher at 2:00), date window at 5:00
9122 – Hours, minutes, central sweep seconds, day of the week subdial at 9:00, month subdial at 3:00 (set with the pusher at 2:00), date window at 6:00
9130 – Hours, minutes, central sweep seconds, date window at 6:00, power reserve indicator at 12:00
9132 – Hours, minutes, central sweep seconds, 24 hour subdial at 6:00, date window at 3:00, power reserve indicator at 12:00

Accuracy:

Miyota claims that the caliber 9100 offers accuracy of -10 ~ +30 seconds per day. This is measured within 10-60 minutes from a full wind via the crown. To fully wind the movement, turn the crown 40 times. The winding direction of the rotor is counterclockwise. A fully wound mainspring will give the watch about 40 hours of running time.