Orient Caliber F4902

Manufacturer	Orient
Caliber Number	F4902
In-House?	Yes
Movement Type	Automatic
Jewels	21
Vibrations Per Hour	21,600 bph
Anti-Shock System	Seiko Diashock
Rotor Winding Direction	Bi-directional (Magic Lever)
Power Reserve	~40 hours
Hand Windable?	No
Hacking?	No
Lift Angle	(Add to comments below…)
Functions	Central hours, central minutes, central sweeping seconds, day/date at 3:00
Country of Manufacture	Japan
Known Models	TriStar DENEB from the Tri-Star Collection (Please add your watch and more known models to the comments below…)

The Orient caliber F4902 is a self-winding automatic movement with 21 jewels. Orient makes their movements in-house in Japan. This is a non-hacking and non-handwinding movement. You may have seen other sites list this movement incorrectly as caliber F49-02 or F.4902, but Orient officially writes the caliber number as F4902.

F4902 VS 46943:

The Orient caliber F4902 is said to be an upgrade to the caliber 46943. The main difference is that the older 46943 has a pusher on the side (2:00) to change the calendar (day of the week), while the newer F4902 calendar can be corrected via the crown.

Power Reserve:

The Orient caliber F4902 has a power reserve of 40 or more hours.

Setting the date:

Avoid setting the date on your F4902 watch within the hours of 8:00pm to 4:00am.

Additional Resources:

• How to locate Orient caliber numbers
• List of Orient calibers