Seiko - Seikomatic Weekdater 時律 (Jiritsu) – Time Rhythm - No reserve price - 6206-8990 - Men - 1964

Offered in this auction by Second Vintage This attractive Seiko Seikomatic Weekdater is a quintessential example of Japanese watchmaking from the mid-1960s, offering a sophisticated aesthetic that rivals Swiss contemporaries of the era. Known for its distinct "Weekdater" layout featuring a full day display at the six o'clock position, this model represents the high-end automatic lineup that paved the way for Grand Seiko's automatic movements. With its clean silver sunburst dial, sharp case lines, and recessed crown, this timepiece embodies the "Grammar of Design" philosophy that defines Seiko's most collectible vintage pieces. It is a stylish and historically significant choice for the discerning collector. Brand: Seiko Model: Seikomatic Weekdater Reference Number: 6206-8990 Serial Number: 4303550 Movement: Automatic Caliber 6206A Dial: Silver Sunburst Case Size: 37 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1964 Condition: Good vintage condition. The watch shows honest signs of age and wear consistent with its 60-year history, presenting a balanced and attractive vintage character. Dial and Hands The silver sunburst dial is the highlight of this timepiece, featuring a classic layout that captures light beautifully. The dial displays the signature "Weekdater" full day window at the six o'clock position and a framed date window at three o'clock. The applied faceted silver indices and sharp dauphine hands provide excellent legibility and a dressy appearance. The text "Water 30 Proof" and "Diashock 26 Jewels" remains crisp. There is some visible patina and light spotting concentrated near the center of the dial, which adds to the authentic vintage charm without detracting from the overall elegance. Case and Crystal The stainless steel case measures a contemporary 37mm, offering a substantial presence on the wrist. The case preserves its original architectural lines, though there are visible surface scratches and marks throughout consistent with age and use. The unique recessed crown is positioned at four o'clock, a design choice intended to emphasize the automatic nature of the movement, as manual winding was not required. The caseback features the iconic dolphin emblem, still visible though softened by wear, alongside the clearly legible serial number and reference data. The crystal appears clear and well-maintained. Movement Powering this watch is the robust Seiko Caliber 6206A automatic movement, featuring 26 jewels and a gold-toned rotor. This movement is renowned for its durability and engineering quality. Timegrapher testing indicates the movement is running between -10 and -15 seconds per day, which indicates a healthy movement offering reliable vintage performance. Strap The watch is fitted with a high-quality burgundy leather strap featuring contrasting stitching. The rich red tone of the leather complements the silver dial perfectly, enhancing the dress-casual appeal of the watch. Condition This piece is in good vintage condition. The case shows normal wear with scratches and small nicks expected from a watch of this production year. The dial has developed a soft, honest patina that verifies its age. The movement is clean and functioning within acceptable vintage tolerances. Dimensions With a case diameter of 37mm excluding the crown, the watch sits comfortably on a variety of wrist sizes. The lug-to-lug length ensures a balanced profile, making it suitable for both formal wear and daily use. Remarks The Seikomatic Weekdater 6206-8990 is a significant reference in Seiko's history, often cited as a benchmark for affordable luxury in the 1960s. Its combination of the 62-series movement and the specific day-date layout makes it a favorite among vintage Seiko enthusiasts. The "Water 30 Proof" text is a desirable detail that dates the dial to the earlier part of the decade before water resistance marking standards changed. History Introduced in the early 1960s, the Seikomatic line was Seiko's upper-mid-range offering, sitting just below the Grand Seiko and King Seiko lines. It was designed to bring high-quality automatic movements to a broader audience. The 6206 movement found in this Weekdater was a workhorse that demonstrated Seiko's mastery of mass-produced, high-precision mechanical movements, eventually evolving into the architecture used in the first automatic Grand Seiko, the 62GS. This specific model captures the innovative spirit of Seiko just prior to the quartz revolution. / Second Vintage SKU: SEI-SMW-0005