Vintage 1966 Grand Seiko High Beat Serviced Hand Winding 4520-8000 36mm.
This is a beautiful example of the 45GS series, produced in May 1966. The 45GS was the second and final Grand Seiko series manufactured by the esteemed Daini Seikosha company. This particular model, the 4520-8000, is the highly sought-after no-date variant, and it closely follows the iconic Grand Seiko “Grammar of Design” principles.
Condition
The watch is in very good original condition overall. The case shows signs of wear consistent with age, but retains its original brushed finish on the front surface between the lugs (see photos), along with well-preserved sharp lines. The case back is exceptionally clean, featuring a gold medallion with original frosting still intact.
The dial is all original, with applied Grand Seiko and Seikosha logos, and is in good condition, with some oxidisation to the edge most notable between ten and eleven o'clock.
Performance
Recently serviced and running well, with accuracy around ±10 seconds per day.
The hacking function operates properly.
During service, the mainspring was replaced due to damage from a previous repair.
Please note: If the mainspring power is depleated and the Watch has stoped, a gentle twist or shake may be needed to get the Hi Beat movement started again. Once wound, it runs consistently without issue.
Additional Details
All original factory finish—the case has not been re-polished and retains its vintage patina.
Case back medallion and text are in outstanding original condition.
Fitted with a brand new premium 18mm Accurate Form (Made in Japan) strap.
Original seals are still in place, so the watch is not currently waterproof.
Please review the provided photos and video carefully, as they best reflect the watch’s condition.
Owning a Vintage Mechanical Watch:
Mechanical watches are not as precise as modern quartz models and will show slight variations in timekeeping.
Regular servicing is part of responsible ownership.
Vintage watches may show signs of wear, age, and patina—each mark adds to their character.
Please handle with care; mechanical movements can be damaged if dropped or mishandled.
We hope you enjoy this timeless piece of horological history and wear it in great health for many years to come!
