The Orient Star RE-AZ0004S00B (also referenced as RE-AZ0004S / REAZ0004S00B) is a flagship, high-horology Japanese hand-wound mechanical timepiece from Orient Star’s prestigious M45 Classic Collection. Recognized globally by watch enthusiasts and collectors by its collection series nicknames—the "M45" or "Mechanical Skeleton"—this 38.8mm dress watch pairs an exquisitely polished SUS316L stainless steel case with an intricate white open-work skeleton dial, an in-house manual-winding movement featuring a breakthrough silicon escape wheel, an exhibition sapphire caseback, and a genuine dark brown/black Cordovan leather strap. Designed for discerning gentlemen who appreciate classical haute horologie, artisanal Japanese craftsmanship, and cutting-edge mechanical innovation, it stands as a masterpiece of fine watchmaking. The defining visual highlight of this RE-AZ0004S00B reference is its open-worked white skeleton dial architecture. Set beneath a dual spherical sapphire crystal with Super Anti-Reflective (SAR) coating, the dial features crisp outer ring Roman numeral markers, heat-treated blued steel hands for hours and minutes, a fan-shaped 70-hour power reserve indicator at 12 o'clock, and a small seconds sub-dial at 6 o'clock. The skeletonized cutouts expose the beautifully hand-finished bridges, mainspring barrel, and the signature vibrant blue silicon escape wheel, delivering a mesmerizing visual display on the wrist. Beneath its artistic exterior, the timepiece is powered by Orient Star’s flagship in-house Caliber F8B62 manual-winding mechanical movement. Developed using Epson’s proprietary MEMS (Micro-Electro-Mechanical Systems) high-precision semiconductor manufacturing technology, the movement incorporates a lightweight, durable silicon escape wheel. This friction-reducing innovation dramatically increases energy efficiency, allowing the watch to achieve an extended 70-hour power reserve while maintaining a daily precision accuracy rate of +15 to -5 seconds per day across 22 synthetic jewels and operating at 21,600 vibrations per hour (3 Hz). The housing features refined dress proportions, measuring 38.8mm in case width (46.5mm lug-to-lug) with a slim profile thickness of just 10.6mm and a 20mm lug width, offering an elegant, low-profile fit under suit cuffs. Exceptional dial transparency and scratch resistance are ensured by a dual spherical sapphire crystal treated with Super Anti-Reflective (SAR) coating to eliminate reflection. The reverse side features a screw-down exhibition sapphire caseback displaying the decorated movement plates. Engineered with daily utility in mind, the case achieves a certified 50-meter (5 bar / 165 ft) water resistance rating. The watch is completed on a genuine Cordovan leather strap, secured by a stainless steel tri-fold deployment clasp with push-button release.
