The Orient RA-AA0810N (also referenced as RA-AA0810N19B / AA0810N) is an outstanding, high-performance Japanese automatic diver-style timepiece from Orient’s renowned Sports Collection. Globally recognized among watch collectors and horology enthusiasts by its popular series nicknames—the "Kamasu II" (or "Kamasu 2") and "Mako III"—this 41.8mm watch pairs a rugged stainless steel case with a multi-toned gradient grey sunburst dial, a day-date calendar window at 3 o'clock, an in-house automatic movement, a premium scratch-resistant sapphire crystal, a 120-click unidirectional rotating bezel, and a solid stainless steel construction. Designed for modern men who appreciate vintage-inspired dive watch aesthetics, underwater reliability, and exceptional Japanese craftsmanship, it stands out as a versatile daily timepiece. The defining visual highlight of this RA-AA0810N reference is its captivating gradient grey dial that subtly transitions from a lighter smoky grey center to a deep black perimeter. Set beneath a premium flat sapphire crystal, the dial features circular and dot hour index markers filled with warm, vintage-tinted luminous material for maximum low-light legibility, framed sword and arrow hands, and a dual day-date calendar display at 3 o'clock. The harmonic contrast between the smoky grey dial background, black bezel insert, and aged-lume indices delivers a sophisticated, retro-modern look on the wrist. Beneath its dive-ready exterior, the watch is powered by Orient’s reliable in-house Caliber F6922 automatic mechanical movement with hand-winding and second-hand hacking capabilities. Operating at 21,600 vibrations per hour (3 Hz) across 22 synthetic jewels, this self-winding movement delivers a dependable 40-hour power reserve with a daily precision rating of +25 to -15 seconds per day. The case features ideal sport-diver proportions, measuring 41.8mm in case width (46.8mm lug-to-lug) with a profile thickness of 12.8mm and a 22mm lug width, offering a planted and comfortable fit across various wrist sizes. Dial protection is provided by a scratch-resistant sapphire crystal that guarantees long-term optical clarity. Built for aquatic adventures and daily physical wear, the solid stainless steel case incorporates a screw-down crown, protective crown guards, and a solid screw-down caseback, achieving a certified 200-meter (20 bar / 660 ft) water resistance rating suitable for swimming, water sports, and recreational 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 catch.
