This serviced 1971 Seiko Grand Seiko 56GS Ref. 5646-7000 represents early-1970s Japanese high horology, embodying the pinnacle chronometric mastery and uncompromising luxury of Suwa Seikosha's flagship lineup. It is powered by the celebrated 25-jewel Caliber 5646 Hi-Beat automatic movement (28,800 bph), featuring manual winding, hacking seconds, and quickset day/date functionality. Following a full mechanical service, it operates with supreme chronometric precision, optimal efficiency, and crisp, dependable performance.
The hallmark of this timepiece is its professionally restored silvery-white dial, capturing light with sharp precision across its immaculate surface. The executive layout is appointed with an applied silver SEIKO logo, the applied "GS" emblem, crisp "HI-BEAT" typography accompanied by the Suwa factory insignia, faceted baton hour markers with sleek black contrast inlays and a prominent double index at 12 o'clock, razor-sharp hands, and a framed day-date window at 3 o'clock.
The 36mm stainless steel cushion-tonneau case preserves its sharp factory geometry, brushed upper surfaces, and polished bevels that sit commandingly on the wrist in true Grammar of Design fashion. The caseback proudly displays its original gold Grand Seiko medallion, intact and well preserved. While the dial has been expertly refinished to pristine condition, the watch head retains its original factory hands, crystal, case, and signed crown. It comes paired with a premium smooth brown leather strap.
An exceptional 1971 Grand Seiko 56GS reference combining elite 28,800 bph Suwa chronometry, iconic cushion-tonneau Grammar of Design architecture, intact caseback gold GS medallion preservation, and a flawless visual presentation.
