The Orient RA-AC0K02E00C (also referenced as RA-AC0K02E10B / RA-AC0K02E) is a high-performance, professional-spec Japanese automatic diver's timepiece from Orient’s acclaimed Sports Collection. Recognized globally among watch collectors and aquatic horology enthusiasts by its popular series nicknames—the "Triton", "New Triton", or "Triton Emerald Diver"—this 43.4mm watch pairs a solid stainless steel case with a rich sunray emerald green dial, an offset screw-down crown at 4 o'clock, a date calendar window at 4 o'clock, a high-performance in-house automatic movement, a scratch-resistant sapphire crystal, a certified 200-meter water resistance rating, and a solid stainless steel construction. Engineered for active sports enthusiasts, scuba divers, and daily wearers seeking an assertive tool-watch aesthetic with premium Japanese mechanical reliability, it transitions effortlessly from marine depths to modern urban wear. The defining visual highlight of this RA-AC0K02E00C reference is its deep, light-reflecting sunray emerald green dial face, framed by a matching bi-color green and black unidirectional rotating elapsed-time dive bezel. Set beneath a premium flat scratch-resistant sapphire crystal, the dial features bold circular and baton hour indices thickly coated with luminous material for superior low-light legibility underwater. A framed date calendar window is positioned discreetly at 4 o'clock alongside the signature offset crown. The harmonic contrast between the vivid green dial, dark bezel ring, bright luminous accents, and lustrous stainless steel casing delivers a commanding, dive-ready presence on the wrist. Beneath its rugged exterior, the watch is driven by Orient's reliable in-house Caliber F6722 automatic mechanical movement with hand-winding and second-hand hacking capabilities. Operating at 21,600 vibrations per hour (3 Hz) across 22 jewels, this self-winding engine provides a 40-hour power reserve, ensuring consistent timekeeping performance driven entirely by natural wrist motion or manual crown winding. The case features substantial, ergonomic diver's proportions, measuring 43.4mm in case width with a case profile thickness of 12.8mm and a lug-to-lug distance of 51.0mm, with the crown uniquely repositioned at 4 o'clock to prevent wrist discomfort during active wear. Superior optical transparency and scratch protection are guaranteed by a premium flat sapphire crystal. Engineered for severe aquatic environments and recreational diving, the solid stainless steel case incorporates a solid screw-down caseback and a protected screw-down crown, achieving a certified 200-meter (20 bar / 660 ft) water resistance rating suitable for swimming, snorkeling, and scuba diving. The timepiece comes completed on an integrated stainless steel link construction, secured by a solid fold-over deployment clasp with a double push-button safety release catch.
