Orient Caliber 46B46 Watch Movement

Manufacturer	Orient (Seiko Epson)
Caliber Number	46B46
In-House?	Yes
Movement Type	Automatic, self-winding mechanical
Lignes	unconfirmed
Diameter	unconfirmed
Jewels	21
Beat Rate / Frequency	21,600 bph / 3 Hz
Lift Angle	unconfirmed
Power Reserve	~40 hours
Hand Windable?	No
Anti-Shock System	Seiko Diashock
Regulator?	Yes (index style)
Functions	Central hours; central minutes; central sweep seconds; pointer style day of the week subdial between 2:00 and 3:00; panoramic date between 3:00 and 5:00 or 7:00 and 8:00 or standard date aperture at 6:00; sun & moon style day/night indicator at 10:00
Hacking Seconds?	No
Country of Manufacture	Made in Japan
Known Models	Orient Sun & Moon (Ref: ET0P002B, ET0P001W, ET0P002W, ET0P003B, ET0P003W, ET0P004W), Orient 65th Anniversary Limited Edition (Ref: ET0T005Y) (Add your watches in the comments below…)

The Orient caliber 46B46 is a self-winding automatic movement with 21 jewels. The notable features of this movement are that it is a day-date with a disc style AM/PM indicator.

The 46B46 is part of the 46 or 46B family of Orient calibers without hacking or manual-winding.

As with all of Orient’s current calibers, the 46B46 is an in-house movement made in Japan. This caliber is found in Orient watches released as far back as 2012.

The rotor is signed:

46B46 / JAPAN / TWENTY-ONE JEWELS / ORIENT WATCH CO. LTD.

There may also be “ORIENT” text above the balance wheel

Accuracy

Orient claims accuracy of the caliber 46B46 movement to be within -15 to +25 seconds per day. These ratings are based on the watch being at room temperature with the mainspring fully wound and the dial up position.

Orient suggests that deviations from the accuracy claims should not be regarded within one day but within a one week period of results.

From the Orient manual: “In order to maintain the watch’s accuracy, we recommend wearing the watch at least 8 hours a day.”

Power Reserve

The Orient caliber 46B46 has a power reserve of 40 hours, give or take. Winding the crown 30 times should wind the spring fully and achieve full power reserve.

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