Seiko Business-A 典光 (Tenkō) 8306-8020 (1967)

Now available at auction from Second Vintage This Seiko Business-A from 1967 is a remarkable example of Japan’s mid-century watchmaking prowess, specifically designed for the rising class of white-collar professionals during Japan’s economic boom. Combining a high-jewel count automatic movement with a robust one-piece case design, this timepiece represents a blend of durability and elegance. The "Business-A" line is highly collectible today for its unique place in Seiko's history, offering a sophisticated aesthetic that has aged with distinct character. Brand: Seiko Model: Business-A Reference Number: 8306-8020 Serial Number: 7505769 Movement: Automatic Caliber 8306 Dial: Silver sunburst Case Size: 36 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1967 Condition: Good vintage condition. The watch displays honest signs of age and wear consistent with a timepiece from this era, retaining a strong and attractive vintage presence. Dial and Hands The watch features a silver sunburst dial that has developed a unique patina over the decades. Most notably, there is visible aging and coloration around the outer periphery of the dial and near the indices, which adds to its vintage charm. The applied baton indices and dauphine-style hands are sharp and legible, featuring black inserts for contrast. A framed day-date window is positioned at the 3 o'clock mark. The text "Diashock 30 Jewels" proudly indicates the high specification of the movement within. Case and Crystal The stainless steel case measures 36mm in diameter and follows the "One Piece Case" (monocoque) construction, designed to improve water resistance by eliminating the removable caseback. The case retains its original form with distinctive lug chamfers, though it shows surface scratches and contact marks throughout, consistent with regular use. The reference and serial numbers on the back are crisp and clearly legible. The crystal exhibits visible scratches and hazing typical of its age. Movement Powering this timepiece is the impressive Seiko Caliber 8306 automatic movement, featuring 30 jewels and Diashock protection. This was a higher-tier specification for the era, designed to offer longevity and reliability. The watch is currently running with a deviation of approximately -35 to -38 seconds per day, which indicates a healthy running movement. Strap The watch is fitted with a stainless steel mesh bracelet that complements the vintage aesthetic perfectly. The clasp is signed with the Seiko logo and "SS" markings. The bracelet fits a wrist size of approximately 18.5 cm and remains in functional condition. Condition This timepiece is in good vintage condition. It shows clear signs of its history, including patina on the dial edges and scratches on the case and crystal. These elements contribute to the watch's honest, unpolished character. It presents as a genuine survivor from the 1960s. Dimensions The case measures 36 mm in diameter excluding the crown. The total wrist size accommodated by the bracelet is approximately 18.5 cm. Remarks The Seiko Business-A is a fascinating model that bridges the gap between the standard Seikomatic line and the higher-end King Seiko models. The use of a 30-jewel movement in a robust steel monocoque case demonstrates Seiko's commitment to quality for the everyday businessman of the 1960s. History Produced in May 1967, this watch hails from a golden era of Seiko manufacturing. The 8300 series of movements were integral to Seiko's lineup in the mid-1960s, offering slim profiles and high efficiency. The "Business" series was marketed explicitly towards the dedicated workforce that drove Japan's post-war economic miracle, making this not just a watch, but a piece of cultural history. / Second Vintage SKU: SEI-SBX-0002