Vintage 36mm 1970 Seiko Grand Seiko 25J Men's Automatic Wristwatch 5646A Japan Stainless Steel 5646-7000. Discover the ultimate in precision and heritage with this authentic vintage Grand Seiko 56GS (Ref. 5646-7000), crafted by Suwa Seikosha in April 1970. Powered by an adjusted 25-jewel Hi-Beat 28,800 BPH automatic movement, this luxury Japanese dress watch showcases Taro Tanaka’s iconic Grammar of Design aesthetic alongside an original gold GS medallion caseback and day-date complication. An exceptional collector's timepiece, it delivers timeless mid-century styling, razor-sharp case geometry, and peerless mechanical craftsmanship.
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About the Brand
Seiko: A beloved brand among collectors, Seiko has long been known for offering exceptional watches at accessible prices. Founded in 1881, the Japanese brand earned worldwide recognition for its divers, sports chronographs, and industry-leading quartz technology. With a lineup that includes historically significant and technically innovative pieces, Seiko remains one of the most widely collected and respected watch brands across all price points.