Grand Seiko 5645-7005 linen dial in 18k yellow gold July 1971

Maker: Seiko
Model: Grand Seiko 5645-7005 hibeat
Year: July 1971
Dial: linen dial, white cream color
Case Material: 18k yellow gold
Case Dimensions: 36mm including crown, 40mm lug to lug. Thickness 10.1mm
Case serial: 170273
Movement: automatic hibeat caliber 5645A
Service history: serviced December 2023. Currently running at +2.3 seconds/day.
Lug Width: 18mm
Bracelet/Strap: high quality light brown alligator strap from Handdn
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 5645-7005, 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 5645-7005 is in fantastic condition. The yellow gold case is in excellent condition with no visible scratches and considering how thick it is, likely just had minimal polishing if any at all in the past with the C-shape maintaining its beautiful curves. All the engravings and hallmarks on the gold case back are very crisp too including the Japanese flag on the case back proving 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 Seiko Hardlex mineral crystal has minor scratches but nothing major. The gold hour and minute hands are original and shows aging but is in great shape. The original gold crown is in crisp condition as well. The movement was serviced by the previous owner in 2023 and is currently running at an excellent +2.3 seconds / day. The watch comes with a new high quality light brown alligator leather strap made by Handdn.

Ships from Japan