The Orient Star RE-AT0004S is a Japan-made Contemporary open-heart automatic for buyers who want mechanical interest without a full skeleton. A white dial frames an aperture over the balance, a power-reserve indicator shows remaining wind, and a flat sapphire crystal with anti-reflective coating keeps the face clear in bright light. The stainless steel case measures 39.3 mm across with a 46.2 mm lug-to-lug and 12.2 mm thickness — compact enough for dress wear, solid enough for daily rotation.
Inside is Orient’s in-house calibre F6R42: automatic winding, hand-winding, about 50+ hours of power reserve, and a manufacturer accuracy guide of roughly +25 to −15 seconds per day. A see-through case back shows the decorated movement. Water resistance is 100 metres (10 bar), which is stronger than typical dress Orient Bambino ratings and suits commuting, rain, and careful swimming.
Why this Orient Star open heart stands out
- Contemporary Semi-Skeleton / open-heart layout with live balance view
- In-house F6R42 automatic with hand-winding and power-reserve indicator
- Over 50 hours power reserve and refined daily accuracy band for the class
- 39.3 mm steel case, 46.2 mm lug-to-lug, 12.2 mm thick, 20 mm bracelet
- Flat sapphire crystal with AR coating; exhibition case back
- 100 m water resistance and JIS Type 1 magnetic resistance
- Steel bracelet with trifold deployant clasp; about 149 g on the official spec
Who it suits
Collectors stepping up from entry Orient or Seiko 5 into Orient Star finishing, buyers who want a silver/white open-heart dial that pairs with business shirts, and anyone hunting an Orient Star Australia stockist with clear specs and local dispatch. If you prefer blue leather open-heart siblings (for example RE-AT0006L), those are separate references — this page is the white-dial bracelet RE-AT0004S.
Technical specifications
- Brand: Orient Star
- Collection: Contemporary Semi Skeleton (open heart)
- Reference: RE-AT0004S (family also seen as RK-AT0004S / RE-AT0004S00B)
- Movement: mechanical automatic calibre F6R42
- Jewels: 22
- Functions: hours, minutes, seconds; open-heart balance aperture; power-reserve indicator; hand-winding
- Power reserve: over 50 hours
- Accuracy (manufacturer guide): approximately +25 to −15 seconds per day
- Case material: stainless steel
- Case width: 39.3 mm
- Case height (lug-to-lug): 46.2 mm
- Case thickness: 12.2 mm
- Crystal: flat sapphire with anti-reflective coating
- Case back: see-through
- Dial: white / silver-tone open heart with lume
- Bracelet: stainless steel (SUS316L), 20 mm, trifold deployant clasp with push button
- Water resistance: 10 bar / 100 m
- Magnetic resistance: JIS Type 1 (4,800 A/m or higher)
- Weight: approximately 149 g
- Country of origin: Japan
Wearing and care notes
100 m water resistance supports rain and swimming when the crown is fully seated; rinse after salt water and avoid hot tubs. The sapphire crystal resists daily scratches better than mineral glass. If the watch sits idle, hand-wind a few turns before wearing. Service intervals depend on use; Chronospride can advise on store-handled support within our published warranty terms.
Frequently asked questions
What movement does the Orient Star RE-AT0004S use?
In-house Orient calibre F6R42: automatic with hand-winding, power-reserve indication, and over 50 hours of reserve when fully wound.
What is the case size of the RE-AT0004S?
Official dimensions are 39.3 mm wide, 46.2 mm lug-to-lug, and 12.2 mm thick, with a 20 mm steel bracelet. It wears smaller than many 42 mm sports Orient models.
Is the RE-AT0004S water resistant enough for everyday wear?
Yes. The official rating is 100 metres (10 bar), suitable for daily wear and swimming within normal use — not a dive watch with a unidirectional dive bezel.
Does the RE-AT0004S have a sapphire crystal?
Yes. Orient lists a flat sapphire crystal with anti-reflective coating on the front, plus a see-through case back.
What does “open heart” mean on this Orient Star?
Part of the dial is cut away so you can see the balance wheel running. It is a semi-skeleton design, not a fully openworked dial like some Modern Skeleton references.
How does RE-AT0004S compare to a standard Orient Bambino?
Orient Star sits above core Orient for finishing, crystal (sapphire vs typical mineral on many Bambinos), power-reserve display, and often stronger water resistance. Bambino remains the simpler dress automatic; RE-AT0004S is the more decorated Contemporary piece.
Where can I buy the Orient Star RE-AT0004S in Australia?
At Chronospride. We stock authentic pieces, inspect before dispatch, and offer free shipping Australia-wide on eligible orders.
Authentic stock, inspected before dispatch. Free shipping Australia-wide on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page.
| Case-Size | 39.3mm |
|---|---|
| Band-Width | 20mm |
| Lug-Width | 20mm |
| Lug to lug size | 46.2mm |
| Case Thickness | 12.2mm |
| UPC | 4942715014261 |
| GTIN | 4942715014261 |
| EAN | 4942715014261 |
