Seiko - Grand Seiko - 5645-7010 - Men - 1971

Now available at auction from Second Vintage This is a captivating example of Japanese horological mastery from the golden era of mechanical watchmaking, embodying the legendary Grammar of Design principles established by Taro Tanaka. The 56GS series represents a pinnacle of vintage Grand Seiko production, combining high-beat precision with refined, angular aesthetics. This particular timepiece is distinguished by its dramatic and highly unique dial aging, offering a distinct visual character paired with an exceptionally well-preserved case featuring its original gold medallion. It stands as a compelling acquisition for the collector who appreciates both mechanical excellence and the uncompromising, honest marks of time. Brand: Seiko Model: Grand Seiko Hi-Beat Reference Number: 5645-7010 Serial Number: 1D0049 Movement: Automatic Caliber 5645A, 25 Jewels Dial: Black dial exhibiting heavy and even stardust oxidation spotting throughout Case Size: 35 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1971 Condition: Good vintage condition with prominent dial patination Dial and Hands The dial of this Grand Seiko presents a striking, heavily patinated surface that commands attention. Originally a stark matte black, the surface has oxidized over the decades to display a dense, even stardust texture characterized by prominent blue and grey spotting across the entire dial face. This localized aging provides a highly organic, constellation-like appearance while remaining entirely legible. The dial features crisp, applied silver-tone baton hour markers with faceted edges that catch the light beautifully. The applied Seiko and GS logos remain sharp and untarnished, sitting proudly above the printed Automatic and Hi-Beat text. The silver-tone dauphine hands feature a contrasting white central stripe and exhibit light signs of aging consistent with the rest of the watch face. A silver-framed date aperture is positioned at three o'clock, displaying clean, black typography on a white background. Case and Crystal The stainless steel case is a superb representation of Seiko's Grammar of Design, featuring sharp, faceted lugs and a beautiful transition between the finely brushed upper surfaces and the highly polished case flanks. The case retains strong lines and factory chamfers, showing honest signs of wear including light scratches and handling marks on the polished sides, but avoiding any heavy polishing that would soften its distinctive geometry. The watch is fitted with a flat crystal that presents clearly, protecting the heavily patinated dial beneath. The original GS-signed crown is present and deeply engraved. Turning the watch over reveals a remarkably well-preserved screw-down caseback, highlighted by the pristine, solid gold GS medallion set into its center. The engraved serial number, reference number, and water resistance markings remain exceptionally crisp and fully legible. Movement Powering this timepiece is the esteemed Grand Seiko Caliber 5645A, a 25-jewel automatic movement operating at a high-beat frequency. The visual inspection of the movement reveals clean bridges, a bright rotor, and clear factory engravings noting its adjustment to five positions and temperature. Exhibiting remarkable accuracy and consistency, performing brilliantly for a vintage timepiece. The timegrapher result reads +8 to +11 seconds per day with strong amplitude. Strap The watch is fitted with a period correct black leather strap featuring contrasting white perimeter stitching. The strap is supple and complements the monochromatic, vintage aesthetic of the heavily patinated dial and sharp steel case. It is secured with a standard stainless steel pin buckle. Condition This Grand Seiko is presented in good vintage condition, defined by its exceptionally strong case geometry and its dramatically aged dial. The stainless steel case shows normal vintage wear but retains its critical sharp edges and brushed finishes, while the gold caseback medallion is stunningly preserved. The dial exhibits heavy, visible spotting and stardust oxidation across its entirely, which stands as a testament to its age and offers a highly unique aesthetic for collectors who value dramatic patina. The movement is remarkably clean and performs with outstanding precision. Dimensions The stainless steel case measures 35 mm in diameter, excluding the signed crown. The lug-to-lug distance and proportions sit perfectly on the wrist, offering the classic, understated elegance expected from a vintage dress watch of this caliber. Remarks Finding a vintage Grand Seiko that balances mechanical superiority with such a distinct, individualized aesthetic is a rare opportunity. The uncompromising sharp lines of the 5645-7010 case perfectly frame the organic, heavily oxidized dial, creating a fascinating juxtaposition between precise engineering and the natural aging process. This is a watch with immense character, ready to be worn and appreciated by a discerning enthusiast. History Introduced in the late 1960s and produced into the 1970s, the 56GS series was one of the final mechanical Grand Seiko lines before the quartz crisis fully took hold. Manufactured by the Suwa Seikosha factory, the 5600 series movements were celebrated for their slim profile, high reliability, and exceptional accuracy, allowing for more elegant and refined case designs. The 5645-7010 specifically embodies the zenith of Seiko's mid-century design language, utilizing flat surfaces and sharp angles to interact with light in a way that remains iconic to this day. These timepieces were built to challenge the absolute best of Swiss watchmaking, and their enduring performance and aesthetic appeal continue to validate that original ambition. / Second Vintage SKU: SEI-SGD-0001