Now available at auction from Second Vintage This is a quintessential example of mid-century Japanese horology, embodying the clean design language that would eventually define the "Grammar of Design." The Seikomatic Weekdater is a significant model in Seiko's history, offering a sophisticated day-date layout and a robust automatic movement. With its recessed crown and balanced dial, this timepiece represents a golden era of manufacturing from the Suwa Seikosha factory, making it a desirable acquisition for collectors of vintage Japanese watches. Brand: Seiko Model: Seikomatic Weekdater Reference Number: 6206-8990 Serial Number: 5501880 Movement: Automatic Caliber 6206 Dial: Silver sunburst with Day and Date Case Size: 37 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1965 Condition: Good vintage condition. The watch presents honestly with visible wear to the case consistent with its age, while the dial remains attractive and legible. The movement is performing well. Dial and Hands The watch features a refined silver sunburst dial that catches the light beautifully. It is adorned with polished, multifaceted applied baton indices that add depth and elegance to the face. The sharp Dauphine hands are characteristic of 1960s dress watches, providing excellent legibility. A framed date window sits at the 3 o'clock position, while the full day display is uniquely positioned at 6 o'clock, a signature trait of the Weekdater line. The text "Water 30 Proof" and the Diashock 26 Jewels marking are crisp, and the applied Seikomatic logo adds a touch of luxury. There is light patina and minor aging visible on the dial surface and periphery, consistent with a watch of this vintage. Case and Crystal The stainless steel case measures a versatile 37mm, offering a presence that is both classic and modern on the wrist. The design features the distinctive recessed crown at the 4 o'clock position, intended to streamline the case profile as the automatic winding made daily manual winding unnecessary. The case preserves its original lines but shows visible signs of use, including scratches and marks on the bezel, lugs, and case sides, typical of a well-loved vintage piece. The screw-down caseback proudly displays the iconic Dolphin emblem and clearly legible reference and serial numbers. The crystal is clear with only minor handling marks. Movement Powering this timepiece is the robust Seiko Caliber 6206 automatic movement. This 26-jewel movement is finished with a gold-toned rotor, visible in the reference images, and is known for its durability and efficiency. The movement offers reliable vintage performance, currently running within vintage tolerances with timegrapher readings between +6 and +15 seconds per day, which indicates a healthy movement. The quickset date function is operational, while the day is set by advancing the hands. Strap The watch is fitted with a deep brown leather strap featuring an alligator-style grain pattern. The strap is in good condition and complements the silver dial and steel case perfectly, enhancing the dressy aesthetic of the timepiece. It is secured by a silver-tone buckle that matches the case material. Condition This timepiece is graded in good vintage condition. It is an honest example that has been worn and enjoyed, evident from the surface scratches on the stainless steel case and bezel. The dial retains a strong visual appeal despite minor signs of aging. The mechanical condition is sound, making it a wearable piece of history. Dimensions The case diameter is 37mm excluding the hidden crown, which was considered a larger size for dress watches of this era, providing a contemporary fit for today's standards. The lug-to-lug distance ensures it sits comfortably on a variety of wrist sizes. Remarks The Seikomatic Weekdater reference 6206-8990 is a cornerstone of any serious Seiko collection. Its specific "Saturday Blue" day wheel adds a charming pop of color to the monochrome dial. This model perfectly captures the transition period where Seiko began challenging Swiss dominance with high-quality, mass-produced automatic calibers. It is a stylish, functional, and historically significant wristwatch. History Introduced in the early 1960s, the Seikomatic line was Seiko's upper-tier automatic offering, sitting just below the Grand Seiko and King Seiko lines. The 62xx series of movements proved so reliable that they formed the base for the first automatic Grand Seiko, the 62GS. The Weekdater models were marketed to the rising business class in Japan, offering practical calendar functions in a package that was elegant enough for the boardroom and durable enough for daily wear. This specific example dates to May 1965, placing it right in the middle of this innovative decade. Payment and Shipping Payment must be completed within 1-3 days after purchase. The watch will be securely packaged and shipped with tracking and insurance for your peace of mind. Please review the pictures carefully before bidding. We strive to showcase the watch from multiple angles for an accurate representation. As with all vintage watches, water resistance is not guaranteed. The watch will be delivered in fully functional working condition. If you have any questions, feel free to contact us after the auction ends. / Second Vintage SKU: SEI-SMW-0006