Grand Seiko 5645-7010 – 1972 “56GS” – Original - Unpolished
Reference/Year: Grand Seiko 5645-7010, 1973
Case: Very good condition with sharp lines and normal light wear
Dial: Light patina on the the dial but presents very nice. Handset and indices have light patina.
Crystal: Original crystal with light wear and scratches. Clear on the wrist however they are visible.
Caseback: Very good condition - medallion intact
Movement: Very clean, running well and keeping good time. Service history unknown.
Quickset: Works properly - replaced with metal quickset star.
The Grand Seiko 5645-7010 is part of the 56GS family, one of the last major mechanical Grand Seiko lines before Seiko’s quartz era took over. The 56GS series was produced in the early 1970s and is well regarded for combining slim proportions, reliable automatic movements, and classic Grand Seiko case design.
This reference uses the caliber 5645, the date-only member of the 56GS family. It is an automatic movement running at 28,800 bph with 25 jewels, and it shares its base architecture with the 5646 day-date caliber. Among vintage Grand Seikos, the 5645 is often appreciated for its balance of wearability, serviceability, and strong everyday performance.
The case, dial, hands, crown, movement, and caseback/medallion are original Grand Seiko components appropriate to this reference, except for the crystal which appears to have been replaced with a period-correct glass crystal. I offer a money-back guarantee on authenticity.
Please review all photos carefully as they form part of the description, and feel free to contact me for additional images, macro shots, or a video of the watch running.