Orient Star Moon Phase Aoi Tsuki Men's Mechanical Watch RK-BT0001S F7M42 41mm JDM (Made in Japan) anti-reflective sapphire crystal, 50m water resistance + extra JDM alligator leather strap (Japanese domestic market) Orient Star “Aoi Tsuki” Mechanical Moon Phase RK-BT0001S (JDM) Short Description The Orient Star RK-BT0001S “Aoi Tsuki” is a flagship model of the prestigious classic M45 collection, inspired by the Pleiades star cluster. This timepiece masterfully combines three of the manufacturer’s most celebrated complications: a power reserve indicator, a date display with moon phase, and a refined semi-skeleton design that reveals the beating heart of its movement. An exclusive model for the Japanese domestic market (JDM) that stands out for its unified dial featuring the textured OS logo and a set of interchangeable straps of the highest quality. Key Features JDM Edition with Double Strap Set: Includes a SUS316L stainless steel bracelet optimized for a perfect fit and an additional genuine alligator leather strap with a folding clasp. Premium Complication Trilogy: Integrates a power reserve indicator at 12 o’clock, a semi-skeletonized window at 9 o’clock, and a date sub-dial with moon phase at 6 o’clock—all on a single dial. “Aoi Tsuki” Dial Design: A textured deep-blue moon background and stars with enhanced luminosity. The center of the inner ring features a discreet OS brand pattern that subtly reacts to light. Dual-Curved Sapphire Crystal with SAR Coating: High-tech anti-reflective treatment on both sides that eliminates 99% of reflections for absolute clarity. Manufacture Caliber F7M42: High-precision automatic movement (+15 to -5 seconds per day) visible through the case back, meticulously polished and decorated. Technical Specifications Component Technical Detail Reference RK-BT0001S (Orient Star Classic M45) Origin Made in Japan (JDM) Movement Automatic Mechanical, Manual Winding, and Hacking 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 Lug 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 White/ivory with Roman numerals, deep blue moon phase, and visible balance wheel Main Bracelet SUS316L steel with butterfly clasp and short adjustment links Additional Strap Genuine black alligator leather with triple folding clasp Water Resistance 50 meters (5 ATM – Suitable for enhanced daily use) Magnetic Resistance JIS Type 1 Weight 145 g (with steel bracelet) Design and Finish Details The eternal flow of time: This unified design returns to the brand’s roots with classic Roman numerals on the outer rim, enhancing the readability of the moon phase complication. The case and movement components feature an impeccable mirror polish combined with brushed surfaces that reflect the excellence of Orient Star’s traditional workshops. Key Selling Points: Total Versatility: Switch from the ruggedness of the steel bracelet to the formal refinement of genuine alligator leather in minutes thanks to the included complete set. Exceptional Visibility: Its double-domed sapphire crystal with SAR technology makes the glass appear invisible, allowing you to appreciate the depth of the skeletonized subdial. Presence and Comfort: Its 41 mm diameter makes a bold statement on the wrist, balanced by redesigned links that offer excellent ergonomics.