The Orient Star RE-AY0107N (also designated as the RE-AY0107 or RE-AY0107N00B) is a flagship, astronomical-themed Japanese mechanical dress timepiece from Orient Star’s prestigious M45 Collection within the Classic series. Celebrated worldwide among high-horology purists, connoisseurs of Japanese mechanical complications, and luxury collectors by its defining series nicknames—the "M45", "Mechanical Moon Phase", "Pleiades", "Subaru", or "Charcoal Gradation"—this 41.0mm masterpiece draws poetic inspiration from the Messier 45 (Pleiades) star cluster, historically revered in Japanese culture as Subaru. It unites high-end artisanal dial craft with in-house Japanese manufacture movement engineering, pairing an exquisitely sculpted SUS316L stainless steel case with an atmospheric charcoal-grey gradation dial, an intricate stamped night-sky texture, a semi-skeleton open-heart aperture at 9 o'clock, a fan-shaped 50-hour power reserve indicator at 12 o'clock, an integrated astronomical moon phase display with an analog date pointer at 6 o'clock, classic Roman numeral indices, a dual-curved sapphire crystal with SAR anti-reflective coating, a 50-meter water resistance rating, and a genuine black leather strap. Perfectly calibrated for discerning gentlemen seeking a rare, poetic complication timepiece that combines mechanical prestige with timeless formal sophistication. The defining visual highlight of this RE-AY0107N reference is its monochromatic, cosmic grey gradation dial architecture. The dial surface features a delicate stamped texture depicting the shimmering stars and cosmic dust of the Pleiades open cluster, rendered through a sophisticated multi-stage coating process. The color smoothly transitions from a soft charcoal-grey at the center to an intense, velvety black at the outer chapter ring, evoking the boundless depths of space just before dawn. Anchoring the dial at 6 o'clock is an artisan astronomical moon phase complication, presenting a rotating deep-blue lunar disc with a golden crescent moon and twinkling stars, encircled by an analog date pointer calendar track. At 9 o'clock, a circular semi-skeleton aperture reveals the pulsating escapement, ticking balance wheel, and synthetic rubies of the in-house movement. The upper hemisphere is harmoniously balanced by a fan-shaped gauge at 12 o'clock indicating remaining spring tension up to 50 hours. Slender skeletonized leaf hands glide smoothly over polished applied Roman numeral hour markers, offering rapid legibility. Protected by a dual-curved sapphire crystal with proprietary SAR (Super Anti-Reflective) coating, the watch delivers exceptional optical clarity and an aristocratic wrist presence. Beneath its celestial exterior, the watch is driven by Orient Star’s premier in-house Caliber F7M62 mechanical automatic movement, entirely designed, manufactured, and hand-assembled in Japan. Built to the highest standards of Japanese fine watchmaking, this 22-jewel caliber beats at a steady frequency of 21,600 vibrations per hour (3 Hz) and delivers exceptional timing precision, calibrated to a tight factory specification of +15 to -5 seconds per day. The movement incorporates an autonomous power reserve of 50 hours on a full wind, with remaining kinetic potential continuously monitored via the analog sub-dial gauge at 12 o'clock. Featuring bidirectional automatic rotor winding, manual hand-winding capability, and a second-hand hacking mechanism for down-to-the-second synchronization, the caliber flawlessly coordinates running hours, minutes, central seconds, an analog date pointer, and the astronomical lunar cycle complication. The case is crafted from premium, corrosion-resistant SUS316L surgical-grade stainless steel, featuring balanced proportions measuring an official 41.0mm in case diameter, a profile thickness of 13.8mm (accommodating the domed crystal and multi-tier complications), a 49.0mm lug-to-lug contour, and a standard 20mm lug width. The exterior case finishing showcases a refined interplay of Zaratsu-inspired mirror-polished bevels and satin-brushed lug flanks. The dial is shielded by a premium dual-curved sapphire crystal with Orient Star's proprietary SAR (Super Anti-Reflective) coating on both surfaces, suppressing 99% of surface glare to make the glass virtually invisible. Turning the watch over reveals a screw-down exhibition display caseback fitted with a sapphire crystal, showcasing the circular Geneva striping (Côtes de Genève), fine perlage, and gold-engraved Orient Star logo on the skeletonized winding rotor. Designed for dependable everyday luxury, the case provides a certified 50-meter (5 bar / 5 ATM / 165 ft) water resistance rating, safely guarding the movement against incidental hand washing, rain, and light water splashes. The timepiece comes fitted with a hand-stitched, premium black genuine Cordovan leather strap, secured by a solid stainless steel tri-fold deployment clasp with a dual push-button safety release.

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