Presented for auction by Second Vintage This Seiko Business presents a compelling example of mid-century Japanese horology, embodying the practical elegance and mechanical innovation that defined Seiko's output during this era. Designed for the professional, this model features a sophisticated day-date layout, showcasing Seiko's commitment to creating highly functional yet aesthetically refined timepieces. The clean lines of the case and the beautifully textured dial make this a versatile and attractive choice for the discerning vintage collector. Brand: Seiko Model: Business Reference Number: 6206-8100 Serial Number: 6D25394 Movement: Automatic, Caliber 6206B, 26 Jewels Dial: Silver sunburst dial with applied indices, showing light age-related spots and surface wear Case Size: 37 mm (excluding the crown) Case Material: Stainless Steel Production Year: December 1966 Condition: Good vintage condition with honest wear and an attractive, evenly aged dial Dial and Hands The silver sunburst dial features a delicate, radiating texture that plays beautifully with the light. Applied, faceted baton indices mark the hours, with double batons at the 12 and 6 o'clock positions adding visual balance. The dial displays the "Seiko" name applied at the top, with "Business," "Diashock 26 Jewels" printed below the center. A prominent feature is the day window positioned uniquely at 6 o'clock, displaying the day in red, complementing the framed date window at 3 o'clock. Upon close inspection, the dial exhibits light, scattered spotting and minor surface marks consistent with age, particularly visible under magnification. The sharp, dauphine-style hands show minor oxidation but retain their elegant profile, sweeping over a well-preserved outer minute track. Case and Crystal The 37mm stainless steel case features a classic, robust profile with sharp, faceted lugs that retain their original geometry. The transition between the brushed upper surfaces and polished flanks is still visible, though softened slightly by honest vintage wear. The smooth, polished bezel frames a domed crystal that appears clear, though minor surface scratches may be present upon close examination. The screw-down caseback is adorned with the Seiko dolphin motif and clearly displays the reference number 6206-8100 and serial number 6D25394. The case shows typical handling marks and light scratches throughout, indicative of regular use over the decades. The crown is partially recessed into the case at the 4 o'clock position, a signature design element of this period. Movement Powering this timepiece is the Seiko Caliber 6206B, a 26-jewel automatic movement known for its reliability and efficient winding system. The movement is cleanly finished with gold-toned plates and a brushed rotor, prominently signed with the Seiko name and jewel count. The day and date complications are integrated smoothly into the caliber's architecture. Running in vintage operational condition. Maintains the authentic mechanical character of the era. The timegrapher indicates a performance of +55 to +60 seconds per day. Strap The watch is fitted with a black textured leather strap with contrasting yellow stitching, providing a handsome complement to the silver dial and steel case. The strap appears to be in good condition, showing light wear, and is secured with a standard steel tang buckle. Condition This Seiko Business is in good vintage condition. The case retains its structural integrity with honest signs of wear, including light scratches and minor nicks. The dial shows attractive, age-consistent patina, including light spotting and surface marks that add character without detracting from its overall legibility. The crystal is generally clear, and the movement is operational, presenting a solid example of a classic 1960s Seiko automatic. Dimensions Case Size: 37 mm (excluding the crown) Remarks This Seiko Business reference 6206-8100 is a superb representation of Seiko's mid-century design philosophy, offering a sophisticated layout with its distinct 6 o'clock day display. The combination of the textured silver dial, sharp dauphine hands, and robust stainless steel case makes it an excellent daily wearer for the vintage enthusiast. Its honest condition and reliable automatic movement ensure it remains a practical and stylish addition to any collection. History During the 1960s, Seiko rapidly expanded its range of automatic watches, aiming to provide high-quality, reliable timepieces for the growing professional class. The "Business" line was introduced to offer sophisticated features like the day-date complication in a refined, durable package suitable for everyday office wear. The Caliber 6206, introduced in the mid-1960s, was a significant movement for Seiko, featuring a quickset date and a unique day display layout. These watches represent a pivotal era in Seiko's history, bridging the gap between their earlier, simpler automatics and the highly advanced calibers that would follow in the late 1960s and 1970s. 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-BDX-0001