Presented for auction by Second Vintage The Seikomatic line represents a golden era of Japanese watchmaking, combining robust automatic movements with refined, elegant aesthetics. Introduced in the 1960s, the Seikomatic-R series was positioned as a premium offering, boasting high jewel counts and sophisticated case designs that bridged the gap between everyday reliability and dress watch sophistication. This particular example captures the quintessential mid-century Seiko design language, featuring a beautifully proportioned stainless steel case and a highly legible day-date layout, making it a compelling piece for collectors of significant vintage Japanese horology. Brand: Seiko Model: Seikomatic-R Reference Number: 5106-8010 Serial Number: 7D01989 Movement: Automatic, Caliber 5106A, 33 Jewels Dial: Silver sunburst dial with applied faceted indices, exhibiting visible spotting and age-related patina primarily on the right hemisphere Case Size: 36 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1967 Condition: Good vintage condition with honest case wear and distinct dial aging Dial and Hands The watch features a classic silver sunburst dial adorned with applied, faceted rectangular indices that catch the light beautifully. An applied Seiko logo sits proudly below the twelve o'clock position, while the Seikomatic-R and Diashock branding are crisply printed in the lower half. A framed day-date aperture is positioned at three o'clock. Upon close inspection, the dial displays prominent, age-related spotting and patina, most heavily concentrated on the right side between the one and five o'clock markers. The faceted dauphine hands exhibit surface oxidation and aging consistent with the overall vintage character of the timepiece, maintaining their original structural integrity while showing the honest passage of time. Case and Crystal The 36 mm stainless steel case retains strong architectural lines, featuring brushed lug tops that transition smoothly into polished case flanks. The polished smooth bezel frames the dial handsomely. While the case shows expected surface scratches, handling marks, and minor nicks commensurate with decades of wear, the overall geometry remains well-defined without signs of heavy over-polishing. The domed acrylic crystal protects the dial and presents cleanly, offering clear visibility of the dial beneath with only minor, superficial wear marks. The original finely fluted crown remains easily operable. Movement Powering this timepiece is the Seiko Caliber 5106A automatic movement, an impressive 33-jewel mechanism known for its durability and advanced engineering for the period. The movement presents cleanly in the provided photographs, with the rotor and bridges showing appropriate factory finishing and clear red engraved text. Performing well within expected vintage tolerances; running strong and steady. Timegrapher results indicate +25 to +29 seconds per day. The caseback clearly displays the Seiko branding alongside the reference and serial numbers, further confirming the watch's mid-century origins. Strap The watch is fitted with a period-correct black textured leather strap, detailed with contrasting white stitching. The strap complements the vintage aesthetic of the stainless steel case and silver dial perfectly, secured by a standard stainless steel pin buckle. It offers a comfortable and stylish option for immediate wear. Condition This Seikomatic-R is presented in good vintage condition. The stainless steel case exhibits normal handling marks and surface wear consistent with its age, retaining good structural lines. The dial shows clear signs of aging, with noticeable spotting and patina localized primarily on the right side, which speaks to its authentic vintage journey. The hands display matching surface oxidation. Mechanically, the watch is running well and maintains the authentic mechanical character of its era. Dimensions The case measures 36 mm in diameter, excluding the crown. Remarks This timepiece offers a wonderful opportunity to acquire a high-jewel count vintage Seiko with genuine character. The combination of the sophisticated 5106A movement and the classic 1960s case geometry makes it a rewarding piece for enthusiasts of Japanese watchmaking history. Its honest wear and distinct dial aging provide a unique, unpolished glimpse into the past. History During the 1960s, Seiko's internal competition between the Suwa and Daini factories drove rapid innovation, resulting in some of the most impressive mechanical watches of the 20th century. The Seikomatic line was a cornerstone of this era, designed to showcase Seiko's mastery of automatic winding technology. The "R" designation often highlighted refined movements with higher jewel counts, aimed at a discerning clientele who demanded both precision and elegance. These watches laid the groundwork for the modern Grand Seiko and King Seiko lines, cementing Seiko's reputation as a global horological powerhouse capable of rivaling the best Swiss manufacturers of the time. 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). Note that with vintage watches, minor signs of wear, aging, or imperfections may be present and are considered normal for watches of this age. 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. If there are any concerns of functionality or defects after delivery, make sure to contact us within 3 days of receiving the watch so we can assist you. As with all vintage watches, water resistance is not guaranteed. If you have any questions, feel free to contact us after the auction ends. / Second Vintage SKU: SEI-MDJ-0002