[SERVICED] Rare Vintage 1976 Seiko 5 Actus SS 21 Jewels 6306-8040 For Sale

[Serviced] Rare Vintage 1976 Seiko 5 Actus SS 21 Jewels 6306-8040* DIAL (ORIGINAL)* CROWN (ORIGINAL)* GLASS (ORIGINAL)* WATCHBAND (ORIGINAL)* CASE (ORIGINAL); CASE SIZE: 37 mm.This serviced Rare Vintage 1976 Seiko 5 Actus SS 21 Jewels Ref. 6306-8040 is a spectacular example of mid-1970s Japanese horology, embodying the sporty elegance and mechanical reliability of Daini Seikosha's domestic market lineup from the era. It is driven by the celebrated 21-jewel Caliber 6306 automatic movement, a high-grade workhorse engineered with Seiko's Magic Lever winding system, Diashock shock protection, a quickset day-date mechanism, and the coveted "SS" (Second Setting) hacking capability to deliver dependable chronometric precision and operational stability. Following a full mechanical service, the caliber runs with optimal efficiency, providing seamless automatic winding, crisp calendar changeovers, and smooth timekeeping that established the Actus SS series as a standout executive sports watch.The face of the watch features a pristine, factory-original silvery-white dial that captures light with crisp clarity across its bright, clean surface. A clean, framed day-date aperture sits neatly at 3 o'clock, displaying a bilingual Kanji and English calendar wheel. The dial is appointed with applied polished silver "SEIKO" typography and the distinct "ACTUS" branding beneath 12 o'clock, balanced by the iconic "SS" script, "21 JEWELS" lettering, and the signature Daini Seikosha lightning bolt insignia above 6 o'clock. Applied faceted baton hour markers with subtle black contrast inlays are paired with matching polished baton hands, delivering timeless mid-1970s aesthetic flair, sharp contrast, and effortless legibility.The stainless steel case remains in excellent vintage condition, showcasing defined angular contours, crisp brushed top surfaces, and polished case flanks that sit comfortably and commandingly on the wrist. Emphasizing its ergonomic design, the case incorporates Seiko's neat semi-recessed crown positioned smoothly at 4 o'clock. Completing this exceptional timepiece is its rare, original factory stainless steel multi-link bracelet, preserving the complete authentic presentation as it left the manufacture in 1976. The watch remains entirely authentic and unaltered throughout, retaining its factory dial, hands, crystal, case, crown, original bracelet, and high-grade 21-jewel automatic movement.Collectors actively seek out the Seiko 5 Actus SS 6306-8040 for its hacking 6306 movement, an esteemed caliber lineage shared with Seiko's legendary domestic divers, paired with classic 1970s geometry and authentic JDM appeal. While surviving examples from 1976 are seldom found retaining their original bracelets and frequently suffer from scratched dials or worn calendar mechanisms, this fully serviced, completely original specimen offers a rare opportunity for enthusiasts of golden-era Japanese horology, making it a handsome and essential addition to any vintage watch collection.