The Alba AU4755X1 (cataloged officially within the Alba Mechanical Active Sports Collection as the AL4755X1 Lime Wave, and referenced internationally as the AU4755X1 or AL4755) is an authoritative, high-performance Japanese automatic mechanical sports timepiece. Created under the technical stewardship and precision manufacturing standards of Seiko Watch Corporation—which established the Alba brand in Japan in 1979 to pair Seiko’s proprietary movement engineering with trend-forward design—this reference stands out as a flagship entry in accessible sports horology. Across international watch enthusiast circles, diver communities, and value-horology collector forums, it has earned cherished community nicknames—the "Lime Wave", "Full Lume Diver", "Mist Green Wave", "Seiko Automatic Sport", "Glow Wave", or "Alba 43 Lume"—for its mesmerizing full-dial luminous treatment, refreshing mist green dial tone, commanding 43.0mm sports case, unidirectional rotating black timing bezel, day-date calendar complication, exhibition see-through caseback, and certified 100-meter water resistance rating. It unites a sculpted 316L solid stainless steel case measuring 43.0mm in diameter with a fully luminescent mist green dial face, high-contrast dark markers, an in-house Seiko-engineered automatic caliber, hardened mineral crystal glass, certified 10-bar water resistance, and an integrated solid stainless steel construction. Perfectly calibrated for outdoor explorers, night-divers, corporate professionals, and sports enthusiasts seeking a bold, worry-free automatic mechanical watch that transitions effortlessly from low-light adventure and aquatic recreation to smart-casual office attire.

The defining visual centerpiece of this AU4755X1 reference is its high-impact Full-Luminous Mist Green Dial. Finished in an ambient pastel mist green (lime) hue under daylight conditions, the entire dial plate is treated with a thick, high-output photoluminescent coating. When transitioning into twilight, darkness, or murky water, the entire surface of the dial erupts into an intense, neon-green glow, reversing traditional watch legibility by illuminating the background to cast the dark indices into sharp relief. Prominent applied black geometric hour markers—featuring an inverted triangle at 12 o'clock, bold rectangles at 6 and 9 o'clock, and circular plots at the intermediate hours—provide an instant, high-contrast reference grid. Broad, faceted black sword and arrow hands glide authoritatively over the face alongside a needle-thin sweep seconds hand. Positioned at 3 o'clock is an integrated Day-Date Calendar window with dual-language day functionality and rapid quick-set adjustment, providing everyday practical utility without disrupting dial harmony. Framing the dial is a unidirectional rotating solid stainless steel timing bezel fitted with an anodized black aluminum insert, featuring a crisp 60-minute elapsed-time scale with a luminous pip at 12 o'clock for accurate dive-time or sports interval tracking. 

Beneath its tailored exterior, the watch is powered by the proven in-house Calibre Y676 Japanese automatic mechanical movement, engineered by Time Module Inc. (TMI) / Seiko Instruments Inc. (SII)—the dedicated movement arm of Seiko Group. Sharing its foundational architecture and mechanical DNA with the legendary Seiko 7S26 workhorse platform, this self-winding caliber is celebrated worldwide for its rugged shock resistance and long-term durability. Operating at an oscillation frequency of 21,600 vibrations per hour (3 Hz, 6 beats per second), the 21-jewel automatic movement utilizes Seiko's proprietary Magic Lever bi-directional winding mechanism, which winds the mainspring efficiently with every movement of the wearer's wrist regardless of rotor rotation direction. When fully wound, the movement delivers an autonomous power reserve of approximately 41 hours. The caliber incorporates built-in shock-absorbing balance jewels (Diashock architecture) to protect the regulating organ against sudden knocks, as well as independent quick-set correctors for both the day-of-the-week and date displays via the crown.

The case is engineered with substantial, contemporary sports proportions, measuring an official 43.0mm in case diameter, an ergonomic lug-to-lug length of approximately 49.0mm, a case profile thickness of 13.0mm, an interhorn lug width of 22.0mm, and a substantial total weight of approximately 152.0 grams. The watch conveys a solid, reassuring heft on the wrist that speaks to its all-metal construction and refined multi-finish execution, while maintaining a balanced profile that wears comfortably during active physical movement. The solid 316L stainless steel case architecture combines vertical hairline satin brushing across the upper lug surfaces with mirror-polished flanks and chamfers. Dial protection is provided by a heavy-duty, impact-resistant flat hardened mineral crystal glass. On the reverse side, the watch features a screw-down exhibition see-through caseback fitted with a clear mineral crystal window, proudly displaying the mechanical caliber, oscillating rotor, and ticking balance wheel in action. Built for dependable daily active resilience, the solid stainless steel case features an ergonomic fluted push-pull crown flanked by integrated case crown guards, securing a certified 10-bar (100 meters / 330 ft) water resistance rating, making it completely safe for swimming, snorkeling, water sports, and heavy rain. The timepiece comes completed on an integrated solid stainless steel 3-link Oyster-style construction featuring brushed outer links and polished accents, secured by a sturdy three-fold deployment clasp with dual push-button safety release.

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