Seiko 5 Actus SS 蒼星 (Sōsei) 6106-7510 (1971)

Available now on auction by Second Vintage The Seiko 5 Actus SS is a definitive example of 1970s Japanese watchmaking, originally designed for the discerning domestic market. This specific example features a mesmerizing deep blue sunburst dial that captures the light beautifully, paired with the robust, high-specification 6106 automatic movement. With its sharp case lines and hidden crown position, it offers a sleek and architectural profile on the wrist that remains stylish and relevant today. Brand: Seiko Model: 5 Actus SS Reference Number: 6106-7510 Serial Number: 1N6724 Movement: Automatic Caliber 6106C Dial: Deep blue sunburst Case Size: 37 mm Case Material: Stainless Steel Production Year: 1971 Condition: Excellent vintage condition with a very clean dial and sharp case preservation. Timegrapher results are included below. Dial and Hands The deep blue sunburst dial is in remarkable condition, retaining a vibrant sheen that shifts dynamically with the angle of light. It features distinct, block-style applied silver hour markers and a matching baton handset, both of which are crisp and legible. The dial is signed with the applied Seiko logo, the 5 Actus badge, and the distinctive "SS" mark above the 6 o'clock position. A framed day and date window is positioned at 3 o'clock, balancing the layout perfectly. Case and Crystal The stainless steel case measures 37mm and exhibits the sharp, geometric lines characteristic of Seiko's design language from this era. The case surfaces show honest wear consistent with age but retain their original definition and edges without signs of over-polishing. The crown is recessed at the 4 o'clock position, creating a streamlined, uninterrupted silhouette along the case flank. The crystal is clear and presents well. Movement Powering this timepiece is the highly regarded Seiko Caliber 6106C automatic movement, featuring 25 jewels. This movement is renowned for its durability and engineering quality. Timegrapher testing indicates a rate of approximately -52 to -60 seconds per day, which indicates a complete and functioning movement. Strap The watch is fitted with a classic black leather strap featuring an embossed crocodile pattern. The dark leather contrasts elegantly with the steel case and complements the deep blue tones of the dial. Condition This piece is in Excellent vintage condition. The dial is exceptionally well preserved, free from noticeable aging or spotting. The case retains strong architectural lines and shows only moderate handling marks typical of a watch from 1971, preserving its honest vintage character and appeal. Dimensions The case measures 37 mm in diameter excluding the crown, offering a versatile size that sits comfortably on the wrist. Remarks This is a Japanese Domestic Market (JDM) model, making it a desirable variant for collectors. The "SS" designation on the dial stands for "Second Setting," highlighting the hacking capability of this upgraded 6106 movement, a premium feature that set it above standard Actus models of the time. History The Seiko 5 Actus line was introduced in the late 1960s and flourished in the 1970s, targeting the young, style-conscious professional in Japan. It combined the legendary durability of the Seiko 5 series with more refined, fashion-forward case designs and dials. The Actus series played a significant role in solidifying Seiko's reputation for producing high-quality, attractive mechanical watches during a pivotal era in horological history. / Second Vintage SKU: SEI-SSN-0002