Presented for auction by Second Vintage The Seikomatic line represents a pivotal era in Japanese watchmaking, embodying the brand's dedication to robust automatic calibers and refined dress watch aesthetics during the mid-twentieth century. The Seikomatic-R, in particular, was crafted for the discerning gentleman who required reliable daily performance wrapped in an elegant, versatile design. This specific example beautifully captures Seiko's iconic design language, balancing a brilliant sunburst dial with a classically proportioned steel case, making it a compelling piece of horological history. Brand: Seiko Model: Seikomatic-R Reference Number: 8306-9030 Serial Number: 6N71156 Movement: Automatic Caliber 8305C Dial: Silver sunburst dial with applied faceted indices, presenting in exceptionally clean and well-preserved condition Case Size: 35 mm (excluding the crown) Case Material: Stainless steel Production Year: 1966 Condition: Good vintage condition with honest case wear and a stunningly preserved dial Dial and Hands The dial is a striking silver sunburst that catches the light beautifully, maintaining a remarkably clean and crisp appearance throughout. Applied faceted baton markers feature black central inserts that enhance legibility, pairing perfectly with the sharp, polished dauphine hands. A cleanly framed date aperture sits at the three o'clock position. The printing, including the Seikomatic-R and Diashock 30 Jewel designations, remains sharp, dark, and fully intact. A close inspection reveals an impressively preserved surface free from significant moisture damage, spots, or staining, representing a highly attractive and well-cared-for vintage face. Case and Crystal The stainless steel case retains its classic mid-century proportions with elegant, sweeping lugs and a smooth polished bezel. The case exhibits well-defined profiles with a pleasing transition between its surfaces. Honest signs of vintage wear, including light surface scratches, minor handling marks, and slight softening of the lug edges, are present across the case flanks and bezel, entirely consistent with regular use over the decades. The domed acrylic crystal protects the dial and shows only faint surface wear, maintaining excellent clarity. The screw-down caseback features the iconic Seiko dolphin motif, alongside clearly legible serial and reference engravings. Movement Inside beats the Seiko caliber 8305C, a highly regarded 30-jewel automatic movement known for its durability and smooth operation. The movement presents cleanly, with visible Seiko branding and caliber designations clearly stamped on the winding bridge and rotor. Running in vintage operational condition. Maintains the authentic mechanical character of the era. The timegrapher records a performance of -55 to -60 seconds per day. Strap The watch is fitted with a handsome, period-correct brown crocodile-embossed leather strap, secured by a classic stainless steel pin buckle. The rich brown tone complements the silver dial and steel case perfectly, offering a refined and comfortable presence on the wrist. Condition This timepiece is presented in good vintage condition. The case shows honest, age-consistent wear with light scratches and handling marks, while the dial remains in near-mint condition with an exceptionally clean sunburst finish and pristine hardware. The mechanical components are intact and the watch stands as a highly attractive vintage survivor. Dimensions The stainless steel case measures exactly 35 millimeters in diameter, excluding the crown, providing a classic, understated, and highly wearable profile that sits elegantly on the wrist. Remarks This Seikomatic-R is a wonderful representation of Seiko's mid-century design philosophy, offering a versatile aesthetic that transitions seamlessly from formal to casual settings. The combination of the intricate, pristine sunburst dial and the reliable automatic movement makes it a fantastic addition for any dedicated collector of vintage Japanese horology. History Introduced in the 1960s, the Seikomatic line was designed to showcase Seiko's rapid advancements in automatic winding technology and shock resistance. The "R" designation pointed to refined movement architectures and elegant case designs, sitting proudly alongside the brand's premium offerings. These watches were celebrated for their proprietary Diashock protection and high jewel counts, ensuring longevity and precision, and they remain highly respected among vintage enthusiasts today for their enduring quality and timeless style. 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-SMD-0011