Good condition [SEIKO] Seiko 1971 Grand Seiko GRAND SEIKO hi-beat Date Automatic 25 jewels Ref. 5645-7000 With warranty, overhauled

【1971 - 56GS】Grand Seiko Hi-Beat – Ref. 5645-7000 Overhauled

 【Product Features】
This is a 1971 "56GS (56 Grand Seiko)".
It is known as the last automatic winding series in the history of vintage Grand Seiko, which dates back to the 1960s.
It features a sharp case design that inherited the "Seiko Style" and a high-precision hi-beat movement (28,800 vibrations). The beautiful patina on the dial, which has appeared after 50 years, tells the unique history of this particular timepiece.

【Operation Checked & Cleaned】
When acquired, this watch had insufficient amplitude and a faulty date change.
It has been repaired and overhauled in-house. Gaskets have been replaced.
To ensure our customers can use it with peace of mind, we have conducted a 48-hour operation check and cleaned it before listing.
Timegrapher measurements show a **daily rate of -12 to -17 seconds and an amplitude of 283 degrees**, maintaining extremely stable accuracy for a timepiece that is half a century old.
Comes with a 1-year operational warranty from the date of arrival (Japan domestic warranty).

 【Key Specifications】
Brand: GRAND SEIKO
Model: 56GS
Model Number (Reference): 5645-7000
Manufacturing Year: 1971
Serial Number: 12**
Movement: Automatic (Cal. 5645A / Hi-Beat)
Case Size: Approx. 36mm (width) / Approx. 41.8mm (height) / Approx. 10.7mm (thickness)
Dial Color: White (excellent condition)
Material: Stainless Steel
Functions: Date display, Hacking function (second hand stop)
Wrist Size: Max. approx. 19cm
Strap: SEIKO leather strap (non-original, unused)
Accessories: None (watch body only)

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 Condition Details
Accuracy: Daily rate -12 to -17 seconds / Beat error 0.0ms / Amplitude 283 degrees (excellent reference values)

《Condition Details》
・Glass: Very minor scratches, good condition
・Case: Minor scratches, no noticeable scratches
・Bezel: Minor scratches, no noticeable scratches
・Case Back: Minor scratches, commemorative engraving, no noticeable scratches
・Strap: (SEIKO made) Not original. Unused, new.
・Hands/Dial: Good condition, no signs of redial

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### Important Notes
Characteristics of Vintage Items: This is a mechanical watch from the 1970s. Although it is currently operating very accurately, please understand that it is a vintage item based on our display standard (within 1-2 minutes daily rate). Regular maintenance is recommended for practical use.
Water Resistance: Please treat it as non-water resistant. Assume that the original water resistance is no longer maintained and be extremely careful about water exposure and humidity.
Calendar Operation: Due to the characteristics of the 56 series movement, absolutely avoid quick-setting the calendar between 8 PM and 4 AM (this may cause malfunction).

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