Orient Star Contemporary M34 Avant-Garde F8 Skeleton RK-BZ0004B Automatic Cal. F8F64 – Black Skeleton Silicon Dial, 42.3 mm, Double Sapphire Crystal, 100 m Water Resistance, SUS316L Stainless Steel, JDM

• High-end Japanese-manufactured Orient Star F8F64 automatic caliber with 24 jewels, an extended 60-hour power reserve, and superior chronometric accuracy (+15 / -5 seconds per day).
• State-of-the-art silicon escape wheel manufactured using Epson’s proprietary MEMS technology, which reduces friction, optimizes energy transfer, and improves movement efficiency.
• Avant-Garde openwork dial from the flagship M34 collection, inspired by the Perseid meteor shower, featuring deep black finishes and a direct view of the mechanical heart.
• Analog 60-hour power reserve indicator at 12 o’clock and a separate small seconds sub-dial at 6 o’clock.
• Double sapphire crystal: front with super-high-definition anti-reflective coating (SAR Coating) and sapphire caseback revealing the finely decorated movement.
• Solid case and bracelet forged from SUS316L surgical-grade stainless steel with a full black finish and a folding clasp with double pushers.
• Water-resistant to 100 meters (10 bar / 10 ATM), ideal for swimming, showering, and continuous, high-demand use.
• JIS Class 1 certified anti-magnetic protection (greater than 4,800 A/m), manual winding system, and hacking seconds function.
• An exclusive catalog model for the Japanese domestic market (JDM), hand-assembled in Japan (Made in Japan).

The Orient Star M34 Avant-Garde Skeleton RK-BZ0004B represents the technical and aesthetic pinnacle of Japanese watchmaking within its select Contemporary M Collections line. Designed for the Japanese domestic market (JDM), this model with an all-black finish reinterprets the contemporary skeleton watch through a three-dimensional mechanical architecture that pays homage to the Perseid meteor shower (M34).

At its heart beats the advanced in-house F8F64 caliber, equipped with an innovative silicon escape wheel developed using high-precision micromechanical technology. This solution reduces the weight of the escapement and minimizes friction-induced wear, enabling an extended power reserve of 60 hours—displayed on the scale at 12 o’clock—and a refined accuracy of +15/-5 seconds per day. The open-worked dial showcases the continuous motion of the balance wheel and the gear train, complemented by a small seconds sub-dial at 6 o’clock and luminescent hands for clear readability.

The 42.3-mm case and its solid bracelet are machined from SUS316L surgical-grade stainless steel, combining brushed surfaces and angular bevels with a contemporary black finish. Equipped with a front sapphire crystal featuring SAR anti-reflective coating, a visible screw-down sapphire caseback, and water resistance tested to 10 bar (100 meters), it combines the artistry of open-worked haute horlogerie with the ruggedness required for the most demanding daily use.

Detailed Specifications
Brand / Collection: Orient Star / Contemporary M34 (Avant-Garde Skeleton JDM)
Reference: RK-BZ0004B
Movement: In-house automatic mechanical movement with silicon escape wheel (Orient Star Caliber F8F64)
Power Reserve: 60 hours (with analog indicator on the dial at 12 o’clock)
Frequency / Jewels 21,600 vibrations per hour (3 Hz), 24 jewels
Accuracy +15 to -5 seconds per day
Functions Hours, minutes, small seconds at 6 o’clock, 60-hour power reserve indicator, open heart, and seconds stop
Case Material SUS316L surgical-grade stainless steel with black finish
Case diameter 42.3 mm
Case thickness 12.4 mm
Length (lug-to-lug) 50.0 mm
Lug width 21.0 mm
Crystal Sapphire with SAR anti-reflective coating
Case back Screw-down with transparent sapphire crystal
Dial color Black skeletonized with luminescent hands
Bracelet: SUS316L stainless steel with black finish and push-button folding clasp
Water resistance: 100 m / 10 bar (10 ATM)
Anti-magnetic shielding: JIS Class 1 (≥ 4,800 A/m)
Weight: Approx. 180 g
Origin: Japan (Made in Japan - JDM)