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Orient Sun and Moon Open Heart

October 12, 2018

Orient, as a watch manufacturer, has been making stunning timepieces for decades. Quite similar to Seiko, this Japanese brand is known for their utmost detail and craftsmanship while maintaining a very affordable price.

The Orient Sun and Moon Open Heart (RA-AS0005S10A) quickly encapsulates what the Orient watch brand is known for. Unbelievable detail, features, and affordability.


Let's all go on a journey with the Orient Sun and Moon Open Heart and see if you will be hooked as well.

Look and Feel

What the first thing the Orient Sun and Moon Open Heart will throw at you is its intricate and feature-studded white dial. The guilloche-patterned center of the dial provides just the right detail and focus while the Roman numerals marked at the 12 and 3 o'clock just embellish it with a touch of class. 

Other features that will not be missed out are the Open Heart window and the Sun and Moon (Day and Night) indicator. The Open Heart window sits at the 9 o'clock position and gives the Orient Sun and Moon a very mechanical and robust feel for owners.


Truly provides an experience of seeing the watch beat and move in action which can give watch owners the organic feeling of owning a mechanical and automatic watch.


The next glaring feature is the Sun and Moon indicator which can be usually seen in mid to high end Swiss dress watches. This particular feature is quite nifty to have because it generally portrays that your watch has complications built on it aside from the normal bells and whistles. 

Overall case diameter sits at 42mm and has a case thickness of 14mm. Ideally dress watches should not be too big and must fit under dress shirt cuffs for the perfect formal experience.


But, its not really a deal breaker considering all the aforementioned features that you will be getting. The lug width is at an unusual size of 21mm so it might get a bit tricky finding the right-sized replacement strap in the future for this timepiece.


It also comes with a good quality black leather strap together with a decent deployant clasp that is signed with the Orient name logo.

Orient Open Heart.jpg
Orient Sun and Moon Open Heart 1.jpg

ORIENT Cal. F6L24 Automatic, Hand-winding, Hacking Movement. Image c/o and property of


The Orient Sun and Moon Open Heart houses its Caliber F6L24 automatic movement which can give its users up to 40 hours of power reserve.


What is good to know is that its hand winding and hacking as well.


The fantastic thing about all the many and wonderful features of the Orient Sun and Moon Open Heart is its pricing. Orient USA has suggested a retail price around $500 USD for the timepiece but you can get it brand new now between $300 - $400 USD.


If that is not affordable enough for you (for a watch of this caliber), then I don't know what else will be. 


Orient's Signed Deployant Clasp


The Orient Sun and Moon Open Heart is the real deal. It transcends the different levels and classes of mechanical dress watches from all over the world.


Not only that it is affordable, but users would simply see a lot more value and complications with their money for this timepiece. 


WIS (Watch Idiot Savant)  will definitely appreciate the same Japanese craftsmanship as Seiko and other watch details. 


If I do see another person wearing this, it tells me the following:

  • Has an eye for rare and beautifully detailed watch dials

  • Loves multiple complications for their watches

  • Equally enjoys wearing dress watches as well

Watch Daddy Rating


  • Watch Complications you only see at higher price point

  • Great Movement

  • Affordable 


  • A bit larger and thicker for a dress watch

Highly Recommended

Watch Daddy Picks

Orient Sun and Moon.png

Orient Sun and Moon Open Heart:  


  • Orient 21 Jewels Self-Winding Automatic Movement (Cal 6FL24)

  • Stainless Steel Case, Genuine Leather Strap, Push Button Connect Type Buckle Clasp

  • Mineral Crystal, Open Heart Skeleton Display, Sun and Moon Indicator

  • Case Size: 42.5 mm Diameter, 14 mm Thickness

  • Water Resistant - 50 M, Transparent Screw Down Case Back

Watch Daddy Alternatives

Orient Sun and Moon Version 3

Orient Version 3.jpg
  • Sapphire Crystal

  • Sun and Moon Indicator

  • Japanese-automatic Movement

  • Case Diameter: 42.5mm

  • Water resistant to 50m (165ft: in general, suitable for short periods of recreational swimming, but not diving or snorkeling

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