Seiko Seikomatic-R 霧ヶ峰 8305-8030 (1967)

Offered in this auction by Second Vintage This Seiko Seikomatic-R is a compelling example of 1960s Japanese horology, combining a robust 30-jewel automatic movement with an engineered unibody case design. The 8305-8030 reference is appreciated by collectors for its clean lines and the technical sophistication of its "One Piece Case," which was designed to improve water and dust resistance by eliminating the screw-down caseback. With a classic silver sunburst dial and running precisely, this timepiece represents an authentic entry point into the world of vintage Seiko dress watches. Brand: Seiko Model: Seikomatic-R Reference Number: 8305-8030 Serial Number: 7565032 Movement: Automatic Caliber 8305 Dial: Silver sunburst with marks and patina Case Size: 35 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1967 Condition: Good vintage condition Dial and Hands The watch features a classic silver sunburst dial layout that captures the light effectively. It is adorned with applied, faceted polished baton hour markers and sharp dauphine hands which retain a crisp appearance. A steel-framed date window is positioned at 3 o'clock. As noted in the images, the dial shows visible signs of aging, including some scratches and surface spots distributed across the face, which attest to its history and original nature. The text "Seikomatic-R Diashock 30 Jewels" remains clear and legible. Case and Crystal The stainless steel case utilizes Seiko's "One Piece" or monocoque construction, offering a streamlined profile with no removable caseback. The case retains its original geometry with defined lugs and bevels, though it displays evident surface scratches and wear consistent with regular use over several decades. The caseback etchings, including the iconic dolphin or horseshoe style markings typical of this era, are visible but show softening from wear. The crystal is clear with minor handling marks. Movement Powered by the reliable Seiko Caliber 8305 automatic movement, this 30-jewel mechanism is a testament to the brand's mid-century engineering. The watch is running exceptionally well for its age. Timegrapher testing indicates an accuracy between +3 to +7 seconds per day, which indicates a healthy movement performing well above standard vintage tolerances. Strap The watch has been fitted with a new black leather strap with a smooth finish and a stainless steel pin buckle. The strap is in unworn condition and complements the dressy aesthetic of the silver dial, making the watch ready to wear immediately. Condition This timepiece is in good vintage condition. While there are cosmetic imperfections such as scratches on the dial and general wear on the stainless steel case, the watch presents honestly as a surviving piece of history. The structural integrity of the case is sound, and the movement is performing with impressive accuracy. Dimensions The case measures 35 mm in diameter excluding the crown, a classic size that sits comfortably on most wrists and slides easily under a dress cuff. The lug width offers standard spacing for strap changes if desired. Remarks The Seikomatic-R reference 8305-8030 is a functional and stylish choice for the vintage enthusiast. Its monocoque case design sets it apart from standard models of the period, adding a layer of collectibility. Despite the cosmetic wear on the dial, the strong mechanical performance makes this a reliable daily wearer for those who appreciate the character of a true unrestored vintage watch. History Introduced in the mid-1960s, the Seikomatic line was positioned as Seiko's upper-mid-range offering, sitting just below the Grand Seiko and King Seiko lines. The "R" series was designed to offer high-quality automatic movements and refined styling to the business professional. The use of 30 jewels in the 8305 caliber demonstrates Seiko's commitment to reducing friction and ensuring longevity, a philosophy that has allowed this specific example to continue running accurately more than five decades after its production in 1967. /Second Vintage SKU: SEI-SMX-0001