The Orient Star M34 F7 Semi Skeleton RE-BY0004A is a Japan-made dress automatic with an open-heart dial inspired by the aurora. M34 takes its name from the star cluster in Perseus. This reference uses a blue mother-of-pearl gradation, small seconds, and a power-reserve hand — not a simple sunburst dress watch. If you want Orient Star’s Contemporary line with movement on show and a 40 mm steel case that still wears like a daily piece, this is the blue MOP version.
Why the RE-BY0004A stands out
The dial is mother-of-pearl with a blue gradation, not painted sunray. An open-heart window shows the balance; small seconds sit off-centre; a power-reserve indicator tells you remaining winding. Dual-curve sapphire with super anti-reflective (SAR) coating on both sides of the glass keeps the MOP readable in office light. The SUS316L case mixes hairline brushing with Sallaz mirror polish. Through the sapphire exhibition back you see the F7F44 plates with Geneva stripes and chamfered edges.
It suits someone who wants an Orient Star that is dressy without being a closed-dial Bambino, and who prefers a steel bracelet over leather. 40.0 mm width and 47.3 mm lug-to-lug sit in the modern mid-size range; 13.0 mm thickness is the trade-off for the open-heart stack and power-reserve train. There is no date window, which keeps the MOP uninterrupted.
Who it is for
- Buyers who want a blue mother-of-pearl Orient Star rather than a flat sunburst dress watch
- Wrists that wear ~40 mm cases comfortably, including under a shirt cuff
- People who like an in-house automatic with hand-winding, hacking seconds, and a 50-hour reserve
- Anyone shopping Orient Star in Australia who wants authentic stock inspected before dispatch
Movement: calibre F7F44
F7F44 is Orient Star’s in-house automatic for this M34 semi-skeleton, made in Japan. It is automatic with hand-winding and a seconds-halt (hacking) mechanism. Official figures: 24 jewels, +15 to −5 seconds per day in static testing, and a 50-hour power reserve. The decorated movement is visible through the sapphire case back. You wind it with the crown when the watch has sat still; you do not need a date corrector because this reference has no date.
Case, crystal, and bracelet
The case is stainless steel (SUS316L): 40.0 mm across (3–9 o’clock), 47.3 mm lug-to-lug (12–6), 13.0 mm thick. Water resistance is 10 bar (100 m) — swimming and rain are in spec; it is not a dive watch. The front crystal is dual-curved sapphire with SAR coating; the case back is sapphire. The bracelet is SUS316L with a 20 mm lug width and a pusher three-fold clasp. Official weight is 153 g. Magnetic resistance is listed at 4,800 A/m.
Technical specifications
- Brand / collection: Orient Star, M34 F7 Semi Skeleton (Contemporary)
- Reference: RE-BY0004A (store SKU RE-BY0004A00B)
- Dial: blue mother-of-pearl gradation, open heart, small seconds, power-reserve indicator
- Movement: Orient Star F7F44 automatic, hand-winding, hacking seconds, 24 jewels, 50-hour reserve, +15 to −5 s/day (static)
- Case: SUS316L, 40.0 mm width, 47.3 mm lug-to-lug, 13.0 mm thick
- Crystal: dual-curve sapphire with SAR coating (front); sapphire exhibition back
- Bracelet: SUS316L, 20 mm lug width, pusher three-fold clasp
- Water resistance: 10 bar (100 m)
- Weight: 153 g
- Origin: Japan
How it compares
The green MOP sibling is RE-BY0005A — same F7F44 architecture and 40.0 / 47.3 / 13.0 mm case, different aurora colour. If you want a larger sports skeleton with a silicon escape wheel and a 60-hour F8 movement, look at the M34 Avant-garde F8 Skeleton line (for example RE-BZ0001S), which is 42.3 mm with a screw-down crown. Classic Orient Bambino models stay closed-dial dress watches at a lower price; this Star is the open-heart, higher-spec step.
Buying Orient Star in Australia
Chronospride lists authentic RE-BY0004A stock. We inspect the watch before dispatch. Free shipping Australia-wide applies on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page. Browse more of the line in Orient watches and Orient Star.
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.
Frequently asked questions
What is the water resistance of the Orient Star RE-BY0004A?
Official water resistance is 10 bar (100 m). That covers rain, hand washing, and swimming. It is not specified as a dive watch, and the exhibition back is not a reason to treat it like a 200 m sports diver.
What movement does the RE-BY0004A use?
In-house Orient Star calibre F7F44: automatic with hand-winding and hacking seconds, 24 jewels, 50-hour power reserve, rated +15 to −5 seconds per day in static testing.
Is the RE-BY0004A dial mother-of-pearl or painted sunray?
Manufacturer copy specifies a mother-of-pearl dial with blue gradation, inspired by the aurora. The open-heart window, small seconds, and power-reserve indicator sit on that MOP surface.
Does the RE-BY0004A have a date window?
No. This M34 F7 Semi Skeleton is a no-date layout so the blue MOP and open heart stay clean.
What size is the M34 F7 Semi Skeleton case?
40.0 mm width, 47.3 mm lug-to-lug, 13.0 mm thick, 20 mm lug width. Official weight is 153 g including the steel bracelet.
Is the Orient Star RE-BY0004A suitable as an everyday watch?
Yes for office and weekend wear, with 100 m water resistance and a steel bracelet. The 13.0 mm thickness and open-heart crystal are more dress-showpiece than a thin dress watch; if you need a slimmer closed dial, a Bambino is the simpler daily.
Where can I buy the Orient Star RE-BY0004A in Australia?
This page is the Chronospride listing for authentic RE-BY0004A stock. We inspect before dispatch. Covered by Chronospride’s 12 months warranty, handled by our team — see the authenticity and warranty page.
| Case-Size | 40mm |
|---|---|
| Band-Width | 20mm |
| Lug-Width | 20mm |
| Lug to lug size | 47.3mm |
| Case Thickness | 13mm |
