Grand Seiko 5645-7010 July 1970
Model: Grand Seiko 5645-7010 hibeat
Case Material: stainless steel
Case Dimensions: 36mm, thickness 10.4mm
Case serial: 071983
Caliber: automatic 5645A
Service history: service history unknown but checked by our watchmaker and currently running at +20.1 seconds/day.
Lug Width: 18mm
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.
This is an all original vintage Grand Seiko 5645-7010.
Overall, this piece is in great condition. The case has likely been polished in the past but retains sharp edges with beautiful Tanaka grammar of design profile. The original matte white dial has naturally faintly patina'd and is in great condition with no blemishes or discoloration. The crystal has been replaced with a 56GS NOS crystal. The handset and crown are all original and in excellent condition as is with the day wheel. The movement history is unknown but is running within vintage standards at this time. The caseback and gold medallion is original and in excellent condition.