The Orient Star RE-BY0004A00B (also referenced as RE-BY0004A / REBY0004A00B) is a flagship, high-horology Japanese automatic timepiece from Orient Star’s acclaimed M34 Contemporary Collection. Recognized globally by watch collectors and horology enthusiasts by its collection series nicknames—the "M34" or "M34 F7 Semi Skeleton"—this 40.0mm watch pairs an exquisitely finished SUS316L stainless steel case with an iridescent blue Mother of Pearl (MOP) semi-skeleton dial, an in-house automatic movement, an exhibition see-through sapphire caseback, and a solid stainless steel construction. Inspired by the deep beauty of the M34 Perseus star cluster and atmospheric auroras, this timepiece bridges classic high-end Japanese watchmaking with contemporary artistic styling. The defining visual highlight of this RE-BY0004A00B reference is its multi-layered blue Mother of Pearl dial face, which shifts in tone under light to evoke the glowing shades of the night sky. Set beneath a dual spherical sapphire crystal with Super Anti-Reflective (SAR) coating, the dial features a semi-skeleton cutout at 9 o'clock that reveals the ticking escapement wheel, a fan-shaped 50-hour power reserve indicator positioned at 12 o'clock, a small seconds sub-dial at 6 o'clock, and sharp faceted hour markers. The rich blue MOP texture paired with polished hands and indices delivers a breathtaking visual presence on the wrist. Beneath its artistic dial, the watch is powered by Orient Star’s high-precision in-house Caliber F7F44 automatic mechanical movement with hand-winding and second-hand hacking capabilities. Running at 21,600 vibrations per hour (3 Hz) across 24 synthetic jewels, this movement achieves exceptional accuracy with a daily precision rating of +15 to -5 seconds per day while delivering a reliable 50-hour power reserve. The case features perfectly balanced contemporary dress proportions, measuring 40.0mm in case width (47.3mm lug-to-lug) with a profile thickness of 12.0mm and a 20mm lug width, ensuring a refined and comfortable fit on the wrist. Exceptional transparency and scratch resistance are guaranteed by a dual spherical sapphire crystal treated with Super Anti-Reflective (SAR) coating to eliminate reflections. The reverse side features a screw-down exhibition sapphire caseback that exposes the hand-decorated movement plates and rotor. Built for daily versatility, the stainless steel case achieves a certified 100-meter (10 bar / 330 ft) water resistance rating. The timepiece comes completed on an integrated stainless steel link construction, secured by a solid tri-fold deployment clasp with push-button release.
