Offered in this auction by Second Vintage The Seiko 5 Actus SS represents a vibrant and highly collectible chapter in Japanese horological history, capturing the dynamic and forward-thinking design language of the 1970s. Originally targeted at young professionals in the Japanese Domestic Market, the Actus line combined robust automatic calibers with sharp, architectural case designs and striking dials. This particular example stands out for retaining its highly sought-after original signed bracelet, offering collectors a remarkably authentic and cohesive vintage wearing experience. Brand: Seiko Model: 5 Actus SS Reference Number: 6106-7520 Serial Number: 1N3507 Movement: Automatic, Caliber 6106C, 23 Jewels Dial: Deep blue dial with applied faceted indices, showing visible scattered surface dust and mild spotting. Case Size: 37 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1971 Condition: Good vintage condition, retaining sharp factory case lines and its original signed bracelet. Dial and Hands The watch features a deep blue dial that serves as a rich backdrop for the applied silver-tone furnishings. The dial is appointed with faceted baton indices featuring white central stripes, paired with matching baton hands that exhibit light, age-consistent oxidation. The applied "SEIKO" and "5 ACTUS" logos at twelve o'clock, along with the printed "SS", "23 JEWELS", and Suwa symbol at six o'clock, remain crisp. A framed day-date aperture at three o'clock displays a classic Kanji and English day wheel. Close visual inspection reveals scattered surface dust particles and mild white spotting across the dial surface, alongside light aging around the luminous plots and indices, presenting an entirely honest and untouched vintage aesthetic. Case and Crystal The 37 mm stainless steel case utilizes a classic 1970s C-shaped cushion profile, characterized by its seamless integration of the lugs and a recessed crown positioned at four o'clock. The case retains excellent definition, showcasing the original transition between the brushed upper surfaces and the brightly polished flanks. While the case exhibits honest signs of wear, including hairline scratches and minor handling marks typical of its age, the overall geometry remains sharp and unpolished. The flat crystal features a beveled edge and shows minor surface scratches and slight edge wear upon close inspection, though it remains highly legible and visually clear. Movement Powering this timepiece is the Seiko Caliber 6106C, a robust 23-jewel automatic movement equipped with hacking seconds, a defining feature of the "SS" or Second Setting Actus models. The movement plates and the clearly stamped rotor show standard vintage aging and mild surface tarnish. Visual inspection of the open case reveals some localized oxidation and pitting on the inner case track beneath the caseback threads, which is common for unsealed vintage pieces of this era, though the movement itself remains clean. Performing well within expected vintage tolerances; running strong and steady. The timegrapher results indicate a rate of -16 to -22 seconds per day. Strap A major highlight of this piece is its original stainless steel folded-link bracelet. The bracelet is fitted with the correct endlinks stamped "XJA" and "201", and secures to the wrist via a highly desirable folding clasp deeply engraved with the "SEIKO 5 ACTUS" branding. The bracelet shows moderate stretch and typical desk-diving marks consistent with decades of genuine wear, accommodating a wrist size of up to 18.5 cm. Condition This Seiko is presented in good vintage condition. It offers a highly authentic and cohesive appearance, highlighted by a strong, well-defined case and the inclusion of its original branded bracelet. The dial and hands show clear, honest signs of aging, spotting, and particulate accumulation, while the case and crystal display normal vintage wear. It is a thoroughly genuine survivor from the golden era of Japanese watchmaking. Dimensions The stainless steel case measures 37 mm in diameter, excluding the recessed crown. The accompanying original signed bracelet is sized to fit a wrist of up to 18.5 cm. Remarks Finding a vintage Seiko 5 Actus that still retains its model-specific signed bracelet is becoming increasingly difficult for collectors. The deep blue dial paired with the architectural cushion case perfectly encapsulates the design ethos of 1970s Seiko, making this a fantastic, character-rich addition to any vintage Japanese watch collection. History Introduced in the late 1960s and peaking in popularity throughout the 1970s, the Seiko Actus and 5 Actus collections were designed specifically for the Japanese Domestic Market. Positioned as stylish, reliable, and slightly elevated everyday watches for the youth and young professional demographics, they frequently featured bold case shapes, vibrant dial colors, and dependable automatic movements. The "SS" designation denoted "Second Setting", highlighting the hacking feature of the 6106 caliber, which allowed for precise time synchronization, a point of mechanical pride for Seiko during this innovative era. Payment and Shipping Payment must be completed within 1–3 days after purchase. Your watch will be professionally and very securely packaged, and shipped with tracking and insurance for your peace of mind. We ship via fast express service, with typical delivery in 1–4 business days (destination dependent). Note that with vintage watches, minor signs of wear, aging, or imperfections may be present and are considered normal for watches of this age. Please review all photos carefully before bidding. We strive to photograph each watch from multiple angles for the most accurate representation. The photos form an important part of the description. If there are any concerns of functionality or defects after delivery, make sure to contact us within 3 days of receiving the watch so we can assist you. As with all vintage watches, water resistance is not guaranteed. If you have any questions, feel free to contact us after the auction ends. / Second Vintage SKU: SEI1HZYJKD000