Presented for auction by Second Vintage The Seikomatic line represents one of the most exciting eras in vintage Japanese horology, a period where Seiko was rapidly innovating and establishing the design language that would define the brand for decades. This particular reference 6218-8971, affectionately known by collectors as the "Weekdater," perfectly captures that mid-century elegance. Featuring an advanced high-jewel movement and a beautifully balanced separated calendar layout, it stands as a testament to Seiko's mid-1960s ambition, offering sophisticated mechanics wrapped in a classically proportioned dress case. Brand: Seiko Model: Seikomatic Reference Number: 6218-8971 Serial Number: 5N35319 Movement: Automatic Caliber 6218A Dial: Silver sunburst dial with applied gold indices and framed calendar windows, presenting remarkably clean Case Size: 37 mm (excluding the crown) Case Material: Gold-plated (SGP) with stainless steel caseback Production Year: 1965 Condition: Good vintage condition with striking dial preservation and honest case wear Dial and Hands The dial is a masterclass in mid-century Seiko design, featuring a delicate silver sunburst finish that catches the light brilliantly. The typography is precise, with an applied gold-tone "SEIKO" logo positioned above the elegantly scripted "Seikomatic" and crisp "DIASHOCK 35 JEWELS" print. A distinctive feature of this caliber is the separated calendar layout, presenting a framed date aperture at the three o'clock position and a fully spelled-out day window thoughtfully balanced at six o'clock. The applied gold faceted baton indices coordinate perfectly with the sharp, unlumed gold dauphine hands. Upon close inspection, the dial remains exceptionally well-preserved, free from heavy spotting, moisture damage, or significant blemishes, exhibiting only some small age-consistent character and a little wear, typical for its age. Case and Crystal The 37 mm gold-plated case embodies classic 1960s proportions with gently sweeping lugs and a neatly recessed crown positioned at four o'clock, maintaining a smooth lateral profile on the wrist. The domed crystal sits cleanly above the dial, offering unobstructed legibility and a pleasing vintage distortion at extreme angles. The SGP (Seiko Gold Plated) finish shows honest, expected signs of wear commensurate with its age. While the upper surfaces and bezel retain an attractive luster with light handling marks, the underside of the case and the reverse edges of the lugs exhibit visible plating loss and surface wear, standard for vintage gold-plated watches of this era. The stainless steel screw-down caseback is wonderfully preserved, retaining deep, crisp engravings of the iconic Seiko dolphin and crown motif, alongside clear reference and serial numbers. Movement Housed within is the highly regarded Seiko Caliber 6218A, a sophisticated 35-jewel automatic movement that served as the foundation for some of Seiko's highest-tier offerings in the 1960s. Close inspection of the movement reveals clean plates and a finely brushed rotor signed with "SEIKO 35 JEWELS". The movement is very healthy. Timegrapher results are +2 to +10 s/day, which is exceptionally good for a watch of this vintage and indicates outstanding mechanical condition, offering performance rarely seen on watches of this age. Strap The watch is fitted with a substantial black leather strap featuring distinctive contrasting double stitching in white and gold tones, securing comfortably to the wrist with a classic gold-tone pin buckle. Condition This Seikomatic is presented in good vintage condition. The dial and hands are stunningly preserved, acting as the visual centerpiece of the watch and showing almost no signs of degradation aside from a little wear. The gold-plated case displays normal vintage wear, with attractive upper surfaces and honest, localized plating wear to the case underside and lug edges. The movement is visibly clean and fully operational. Dimensions The watch measures a contemporary 37 mm in diameter excluding the crown, providing a substantial yet elegant vintage presence suitable for a wide variety of wrist sizes. Remarks The Seikomatic Weekdater represents a pinnacle of Seiko's mid-century automatic dress watches, blending technical sophistication with undeniable aesthetic charm. The prominent day display at six o'clock remains a favorite among collectors, and finding an example with such a pristine dial makes this a highly compelling opportunity for any serious enthusiast of vintage Japanese horology. History Introduced in the mid-1960s, the Seikomatic line was engineered to showcase Seiko's rapid advancements in automatic winding technology. The Caliber 6218 was an upper-echelon movement, heavily based on the architecture that would eventually power the first automatic Grand Seikos. With its impressive 35-jewel count and sophisticated construction, the 6218-8971 was marketed as a luxurious and highly precise daily wearer for the discerning professional. The beloved "Weekdater" layout, separating the day and date complications for ultimate dial symmetry, has since become an iconic signature of Seiko's golden era of design. 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-SDJ-0003