Orient Star Caliber 40S62

Brand	Orient Star
Caliber Number	40S62
Manufacturer	Epson (Seiko Instruments Inc.)
Movement Type	Automatic, self-winding mechanical
Jewel Count	24
Beat Rate / Frequency	21,600 vph / 3 Hz
Lift Angle	Unconfirmed
Accuracy Rating	-15 ~ +25 sec/day
Power Reserve	40 hours
Hand-Windable?	Yes
Anti-Shock Device	Diashock
Hand Count	4
Functions	Central hours; central minutes; small seconds subdial at 6:00; power reserve indicator at 12:00; open balance wheel at 9:00
Hacking Seconds?	Yes
Country of Manufacture	Made in Japan
Known Models	Orient Star Modern Skeleton (Ref: DK05-C0-B) (Add your watch to the comments below…)

The Orient Star caliber 40S62 is an automatic watch movement with an open (aka open-heart or skeletonized) balance wheel and a power reserve indicator. This movement is found in the Orient Star Modern Skeleton watches that were introduced in 2014 (discontinued as of this post).

Orient Star officially refers to watches with this movement as: “Mechanical Watch, Power Reserve Indicator, Automatic & Hand Winding Mechanism”.

40S62 VS F6F44:

The calibre F6F44 is considered to be an upgrade to the 40S62. Aside from an updated skeletonized balance wheel porthole on the dial, there is also an increase in power reserve:

• 40S62: ~40 hours
• F6F44: ~50 hours

Additional Resources:

• Official instruction manual (pdf)
• Orient Star press-release from August 5, 2020 (pdf)