Orient Star Moon Phase Seiran RK-BT0002L Men's Mechanical Watch, 41mm, JDM (Made in Japan), double-domed sapphire crystal, steel band, F7 M42, JDM (Japanese domestic market) Orient Star “Seiran” Mechanical Moon Phase RK-BT0002L (JDM) Short Description The Orient Star RK-BT0002L “Seiran” is a flagship piece from the brand’s classic M45 collection. This sophisticated 41-mm timepiece stands out for its deep navy blue dial featuring a subtle textured pattern that pays homage to the night sky of the Pleiades. It features an in-house F7M42 caliber that harmoniously displays three iconic Orient Star complications: a power reserve indicator, a semi-skeleton window, and a moon phase subdial. An exclusive Japanese domestic market (JDM) model crafted from the highest-grade surgical steel. Key Features JDM (Japanese Domestic Market) Edition: A high-end model imported directly from Japan, highly valued for its exclusivity and Japanese quality control. “Seiran” Textured Dial: A captivating navy blue dial featuring a subtle OS brand pattern that reacts dynamically to the light. Signature Complication Trilogy: A perfectly balanced layout featuring a power reserve indicator at 12 o’clock, an open heart movement view at 9 o’clock, and a moon phase complication with a hand-operated date display at 6 o’clock. Sapphire Crystal with SAR Coating: Double-domed crystal with high-tech anti-reflective coating that eliminates 99% of visual distractions. Premium SUS316L Construction: Case and bracelet made entirely of surgical-grade stainless steel, offering high corrosion resistance and superior luster. Technical Specifications Component Technical Detail Reference RK-BT0002L (M45 Classic Collection) Origin Made in Japan (JDM) Movement Automatic Mechanical, Manual Winding, and Hacking Second Hand Caliber Orient Star Cal. F7M42 In-House (22 Jewels) Static Accuracy +15 to -5 seconds per day Power Reserve Over 50 hours (with indicator at 12 o’clock) Case Material Surgical-grade stainless steel (SUS316L) Case Dimensions Diameter: 41.0 mm | Height (Lug-to-Lug): 49.0 mm Thickness 13.8 mm Strap Width 20 mm Front Crystal Double-domed sapphire with super anti-reflective coating (SAR) Case Back Screw-down and transparent with flat sapphire crystal Dial Navy blue with classic Roman numerals Bracelet SUS316L steel with push-button folding clasp Wrist Size 140 mm to 200 mm Water Resistance 50 meters (5 ATM - Suitable for enhanced daily use) Magnetic Resistance JIS Class 1 (4800 A/m or higher) Weight 145 g Design and Finish Details The Flow of Time and the Cosmos: The “Seiran” case masterfully combines brushed edges with mirror-polished finishes on the bezel, enhancing the depth of the dial. The transparent case back reveals the meticulously decorated movement, allowing you to appreciate the balance wheel, beveled bridges, and polished oscillating weights of Orient Star engineering. Key Features for Buyers: Timeless Symmetry and Readability: The placement of Roman numerals along the outer edge and the stylized blade-style hands ensure a clear reading of the time and moon phase. Invisible Crystal Effect: Thanks to the sapphire crystal’s double curvature and its SAR coating, the crystal appears to disappear completely in daylight. Everyday Comfort: With a balanced weight of 145g and a short-link bracelet designed to fit ergonomically on the wrist, it is an ideal choice for both formal occasions and premium everyday wear.