Offered in this auction by Second Vintage This Seikomatic Weekdater is a prime example of Seiko's horological dominance in the early 1960s, featuring the highly desirable 33-jewel Seikosha movement. With its distinctive day display at the six o'clock position and the elegant "hidden" crown design, this J13080 reference offers a sophisticated aesthetic that rivals its Swiss contemporaries. The 37mm case provides a substantial wrist presence that feels modern while retaining classic vintage proportions, making it a perfect choice for the discerning collector. Brand: Seiko Model: Seikomatic Weekdater Reference Number: J13080 Serial Number: 3914512 Movement: Seikosha Automatic Caliber 400 Dial: Silver sunburst Case Size: 37 mm Case Material: Stainless Steel Production Year: 1963 Condition: Excellent vintage condition with a timegrapher result of -55-60s/day, which indicates a functioning movement offering vintage performance. Dial and Hands The watch features a stunning silver sunburst dial that remains in remarkably clean condition for its age. It is adorned with polished, faceted applied baton indices that catch the light beautifully. The dauphine-style hands are sharp and free of corrosion. A framed date window sits at the three o'clock position, while the signature "Weekdater" full day window is perfectly centered at the six o'clock position, adding vertical symmetry to the design. The dial text is crisp, featuring the Applied Seikomatic logo and the "Water 30 Proof" designation which speaks to its original specifications. Case and Crystal The 37mm stainless steel case presents very sharp lines and robust lugs that have retained their definition. The case design features the signature recessed crown at the four o'clock position, a design choice intended to emphasize the automatic nature of the watch, as manual winding was deemed unnecessary. The crystal is clear and free of distracting marks. The caseback displays the faint outline of the iconic Seiko dolphin emblem, a testament to its history, along with the clearly legible reference and serial numbers. Movement Powering this timepiece is the high-grade Seikosha automatic Caliber 400 family movement, boasting an impressive 33 jewels. The movement appears visually clean with a gold-toned rotor and bridge work. It is currently running with a deviation of approximately -55 to -60 seconds per day, which is an acceptable rate for an unserviced vintage timepiece of this era. Strap The watch is fitted with a high-quality reddish-brown leather strap featuring contrast stitching. The rich tone of the leather complements the silver sunburst dial perfectly, adding a layer of warmth to the overall cool stainless steel aesthetic. The strap is in excellent, unworn condition and is ready for immediate wear. Condition This timepiece is in excellent vintage condition. The dial is exceptionally well-preserved, showing almost no signs of aging. The case shows honest signs of wear consistent with a watch from 1963, with light surface scratches but no major dings or dents. The movement is functioning reliably within vintage tolerances. Dimensions The case measures 37 mm in diameter excluding the crown, making it slightly larger than many standard dress watches of the 1960s and suitable for modern tastes. Remarks The Seikomatic line was Seiko's upper-mid-range automatic offering in the early 1960s, sitting just below the Grand Seiko in the hierarchy. The 33-jewel count in this specific Weekdater model was a significant flex of engineering prowess at the time. Finding a J13080 with such a clean dial is becoming increasingly difficult, making this a wonderful opportunity to own a piece of the "Grammar of Design" era history. History Introduced in the early 1960s, the Seikomatic series played a pivotal role in popularizing automatic watches in Japan. The Weekdater models were particularly innovative for their day-date complications and helped establish Seiko as a manufacture capable of mass-producing high-precision, beautifully finished automatic movements that could compete on the global stage. 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). 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. 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-SWJ-0003