The Alba A4B029X1 (also designated across international catalogs as the A4B029) is an authoritative, high-performance Japanese quartz sports chronograph timepiece from Alba’s acclaimed Active Collection. Engineered under the horological stewardship of the world-renowned Seiko Watch Corporation—which established the Alba brand in Japan in 1979—this reference unites classic diver-inspired tool-watch architecture with high-precision multi-dial stopwatch timing. Celebrated among sports chronograph enthusiasts, outdoor adventurers, and collectors of Seiko-family timepieces by its popular series nicknames—the "Diver-Style Chronograph", "Deep Green", "Urban Sports", "Active Diver Chrono", "Emerald Chronograph", or "Alba Deep Green"—this 43.0mm watch commands immediate attention on the wrist. It pairs a robust solid stainless steel sports case and elapsed-time rotating bezel with an evocative deep green sunray chronograph dial, applied luminous hour markers, polished sword hands, a multi-subdial layout featuring 60-minute stopwatch registers and a 24-hour indicator, a framed date aperture, an in-house Japanese quartz chronograph movement, a scratch-resistant mineral crystal, certified 100-meter water resistance, and a solid stainless steel construction. Perfectly calibrated for gentlemen seeking a rugged, reliable, and visually dynamic daily sports chronograph that transitions effortlessly from active aquatic adventures to smart-casual professional settings. The defining visual centerpiece of this A4B029X1 reference is its rich, multi-layered deep green sunray dial face. Finished with fine radial brushing, the dial dynamically shifts beneath ambient light across varying shades of forest jade, dark emerald, and shimmering pine. The dial architecture is engineered for effortless, split-second legibility, integrating three recessed sub-dials that enhance its athletic instrument styling: a 24-hour cycle display at the 3 o'clock position, a 60-minute chronograph elapsed time counter at 6 o'clock, and running sub-seconds at 9 o'clock. Bold, applied faceted steel hour markers combining circular plots and baton indices are generously filled with high-potency luminescent material, framed by a crisp outer perimeter minute and fractional seconds track. Polished sword-style hour and minute hands sweep authoritatively across the dial face, accompanied by an energetic central chronograph sweep seconds hand. Positioned neatly between 4 and 5 o'clock is an angled date calendar window, providing everyday utility without disrupting the chronograph symmetry. Encircling the dial is a rugged coin-edge diver-style bezel with a contrasting elapsed-time insert, flanked by dual ergonomic chronograph pushers and protective case crown guards, lending the watch an unmistakable sports-diver presence. Beneath its commanding exterior, the watch is driven by an in-house Japanese analog quartz chronograph caliber engineered under the exacting manufacturing standards of Seiko Watch Corporation (the proven Seiko-Epson Caliber VD53 quartz chronograph platform). Built for precision timekeeping and worry-free daily dependability, this electronic movement operates with a factory-calibrated standard deviation rating of ±20 seconds per month. Powered by a standard silver oxide battery cell, the movement delivers approximately 2 to 3 years of continuous operation on a single battery, offering dependable "grab-and-go" convenience without requiring manual winding or kinetic charging. The movement coordinates central timekeeping (hours, minutes) alongside full chronograph stopwatch functionality capable of measuring elapsed time up to 59 minutes and 59 seconds, a synchronized 24-hour military time sub-dial, and an efficient quickset date mechanism operated via the fluted center crown. The case is engineered with substantial, contemporary sports proportions, measuring an official 43.0mm in case diameter with a case thickness of approximately 12.0mm, an ergonomic lug-to-lug contour, and a standard 22mm lug width, ensuring an authoritative, planted, and comfortable drape across a wide range of wrist sizes. The solid stainless steel case architecture combines fine circular satin brushing across the upper lug hoods with mirror-polished side flanks and chamfered bevels. Dial protection is provided by a scratch-resistant flat mineral crystal glass that shields the multi-layered display against daily abrasions and impacts. Flanking the main crown are two tactile piston-style pushers at 2 and 4 o'clock that provide crisp, positive mechanical feedback when starting, stopping, and resetting the chronograph counters. Built for an active terrestrial and aquatic lifestyle, the solid stainless steel case incorporates a solid screw-down caseback securing a certified 100-meter (10 bar / 10 ATM / 330 ft) water resistance rating, safely guarding the movement against swimming, snorkeling, water sports, and heavy rain. The timepiece comes completed on an integrated solid stainless steel multi-link construction featuring brushed link surfaces and polished side accents, secured by a solid three-fold deployment clasp with a dual push-button safety release.

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