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Special Dial

Grand Seiko 5646-7005 linen dial in 18k solid gold August 1970

Grand Seiko 5646-7005 linen dial in 18k solid gold August 1970

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Maker: Seiko
Model: Grand Seiko 5646-7005 hibeat
Year: August 1970
Dial: linen dial, originally white and now cream color from patina
Case Material: 18k yellow gold
Case Dimensions: 36mm including, 40mm lug to lug. Thickness 10.1mm
Case serial: 0801XX
Movement: automatic hibeat caliber 5646A
Service history: serviced March 2023. Currently running at +6.7 seconds/day.
Lug Width: 18mm
Bracelet/Strap: brown alligator strap
Box/Papers: none


The 56GS series of vintage Grand Seiko is second only to the 61GS with regards to the diversity of the watches produced. The three movements that were used in this series were the 5641A (no-date), 5645A (date) and 5646A (day-date), making this the only series with all three complication versions. In all there were 35 different models in the 56GS series. The C shaped 7005 case series of the 56GS were all constructed in 18k yellow gold. The 5646-7005, offered also with a GS gold bracelet, holds the distinction of being the most expensive Grand Seiko in the entire vintage Grand Seiko line up. It went for sale for JPY 500,000 which, adjusted for inflation, would be about JPY 1,700,000 today.

Overall, this all original Grand Seiko 5646-7005 is in fantastic condition. The yellow gold case shows a nice patina and although it has some bumps and scratches, which is natural considering its age, the case likely had miminal polishing if any at all in the past with the C-shape maintaining its beautiful curve. All the engravings and hallmarks on the gold case back are very crisp too including the Japanese flag within the case back providing evidence that the gold was certified by the Japanese mint. The original linen textured dial has aged well and has developed an attractive cream color. The dial has no major blemishes. The crystal also has no scratches. The gold hour and minute hands are original and shows aging but is in good shape. The original gold crown is in crisp condition as well. The movement was serviced by our watchmaker and is currently running at -6.7 seconds / day. The watch comes with a brand new brown alligator leather strap.

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