Looking for a silver Orient Star semi-skeleton that still reads clean at work? The Orient Star M34 F7 Semi Skeleton RK-BY0011S pairs a monochrome open-heart dial with Orient’s in-house F7F44 automatic, sapphire crystal, and a contemporary 40 mm steel case. It is a dress-leaning mechanical piece with real finishing depth for Australian buyers who want more than a sealed dial.
Why the RK-BY0011S stands out
- Semi-skeleton open heart — a clear window into the decorated movement without a fully cut-away dial.
- In-house F7F44 automatic — self-winding with hand-winding, about 50 hours of power reserve, and a power-reserve indicator on the dial.
- Tuned accuracy target — Orient rates the calibre around +15 to −5 seconds per day under reference conditions.
- Sapphire crystal — harder everyday scratch resistance than mineral glass.
- Wearable contemporary sizing — about 40 mm diameter, 47.3 mm lug-to-lug, 13 mm thick, 20 mm lug width.
- 100 m water resistance — suitable for rain, hand washing, and swimming with care; not a dive watch.
On the wrist the light silver dial keeps the open-heart animation from feeling busy. The layout suits office wear, dinners, and weekends when you want a mechanical statement that still matches a shirt cuff. Compared with entry Orient Classic models, Orient Star brings higher finishing expectations on the movement and dial furniture.
Who it suits
Choose RK-BY0011S if you want a monochrome Orient Star skeleton look, Japanese in-house automatic architecture, and a mid-size steel sports-dress case. If you prefer a darker dial for contrast, compare the blue M34 sibling RK-BY0010L on our Orient Star shelf. For a leather open-heart configuration with power reserve, see RE-AT0006L.
Technical specifications
- Brand: Orient Star
- Reference / SKU: RK-BY0011S (aligned with RE-BY0011S family listings)
- Collection: Contemporary M34 F7 Semi Skeleton
- Movement: In-house automatic calibre F7F44
- Jewels: 24
- Frequency: 21,600 bph (3 Hz)
- Functions: Hours, minutes, small seconds, power-reserve indicator; hand-winding and hacking as specified for F7F44
- Power reserve: Approximately 50 hours
- Accuracy (maker reference): About +15 to −5 seconds per day
- Case: Stainless steel, approx. 40.0 mm diameter
- Lug-to-lug: Approx. 47.3 mm
- Thickness: Approx. 13.0 mm
- Lug / band width: 20 mm
- Crystal: Sapphire
- Dial: Silver / monochrome semi-skeleton open heart
- Water resistance: 100 m / 10 ATM (static rating; avoid hot showers and strong impacts on the crown)
- Weight (maker typical for steel configuration): About 153 g
- Origin: Japan (Orient Star)
Specifications above follow manufacturer and established retailer data for this reference. Minor production tolerances can apply. Always confirm the crown is fully seated before water exposure.
Wearing and care tips
Wind the crown gently if the watch has sat idle, then wear it daily so the automatic winding keeps the reserve topped up. Rinse briefly with fresh water after swimming in the ocean and dry the case and bracelet. Service intervals depend on wear; a mechanical service every several years keeps timekeeping and seals healthy. Store away from strong magnets and extreme heat.
Frequently asked questions
What movement is inside the Orient Star RK-BY0011S?
It uses Orient’s in-house automatic calibre F7F44. Expect self-winding, hand-winding, roughly 50 hours of power reserve, a power-reserve indicator, and a maker accuracy target around +15 to −5 seconds per day.
What is the case size of the RK-BY0011S?
About 40 mm across, 47.3 mm lug-to-lug, and 13 mm thick, with 20 mm lugs. That sits in a modern mid-size range for most adult wrists.
Is the Orient Star RK-BY0011S a dive watch?
No. It is rated to 100 m water resistance, which is strong for a semi-skeleton dress-sports watch, but it is not a purpose-built diver. Treat it as swim-capable with care, not a tool dive instrument.
Does RK-BY0011S have a sapphire crystal?
Yes. The crystal is sapphire, which resists everyday scratches better than mineral glass.
Where can I buy Orient Star RK-BY0011S in Australia?
You can buy this reference from Chronospride when in stock. We inspect pieces before dispatch and offer free shipping Australia-wide on eligible orders.
What warranty do I get from Chronospride?
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.
Browse more Orient Star watches and the wider Orient collection, or start from automatic watches if you are still comparing movements.
| Case-Size | 40mm |
|---|---|
| Band-Width | 20mm |
| Lug-Width | 20mm |
| Lug to lug size | 47.3mm |
| Case Thickness | 13mm |
| UPC | 4942715032906 |
| GTIN | 4942715032906 |
| EAN | 4942715032906 |
