This is an exceptionally rare July 1971 Grand Seiko "56GS" Vintage Automatic (Ref. 5641-7000), completely original and beautifully dynamic. Highly revered by elite horology purists, this specific variant stands as the ultimate "connoisseur's choice"—an incredibly rare Non-Date execution that showcases a flawlessly symmetric dial, backed by a pristine, unpolished factory solid gold GS caseback medallion.
Product Highlights:
Ultra-Rare Non-Date 56GS Profile: While the majority of Cal. 5646 movements housed day-date windows, the elusive Cal. 5641A strips away complications to emphasize the pure, unblemished geometry of the dial, making it significantly scarcer on the vintage market.
Pristine Solid Gold GS Medallion: A true miracle find for collectors—the caseback preserves its original solid gold "GS" factory center emblem in near-flawless relief contour with zero degradation or erosion.
Legendary Hi-Beat Heart: Driven by the in-house Suwa Seikosha Cal. 5641A automatic movement ticking at a precise high-frequency 28,800 BPH (Hi-Beat), engineered during Seiko’s historic era of absolute chronometer dominance.
Luxury Brand-New SEIKO Genuine Leather Strap: Freshly paired with an authentic, premium black textured SEIKO factory original leather strap (Strap Model: DAE4R 18) with fresh steel hardware.
Condition Details (100% Honest Antique Disclosure):
Status: Excellent Vintage Condition / Fully Operational & Winding Smoothly.
Movement: Spins up effortlessly via the original signed "GS" crown. Holds standard vintage power reserve and maintains reliable daily time tracking.
Cosmetics: The stainless steel cushion mid-case retains its sharp faceting but displays expected, honest antique micro-scuffs, bezel edge rubs, and hairline handling scratches from historic office wear. The original white dial is remarkably crisp with no heavy moisture spotting or edge peeling.
Specifications:
Brand: Grand Seiko / SEIKO (Suwa Factory, Japan)
Model / Line: 56GS Hi-Beat Automatic
Reference Number: 5641-7000
Movement: In-house Caliber 5641A (28,800 Vibrations / Automatic-Wind & Hand-Wind)
Serial Number: 178498 (Dating to July 1971)
Case Width (excluding crown): Approx. 33.0 mm (1.30")
Lug Width / Strap Fit: 18.0 mm (0.71") (SEIKO New Leather Strap Installed)
Wrist Fit Size: Adjustable between 14.0 cm to 19.0 cm (5.5" to 7.5")
Inclusions: Watch Unit with New SEIKO Strap Only
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