Grand Seiko
Grand Seiko Grand Seiko 56GS 5645-7010 5645
The Grand Seiko Grand Seiko 56GS 5645-7010 (reference 5645) is a watch. It runs on the automatic caliber 5645. It was made from 1970 to 1977.
Specifications
Case
- Reference
- 5645
- Collection
- 56GS
Movement
- Movement
- Automatic
- Caliber
- 5645
- Frequency
- 28,800 vph
- Functions
- Date
Production
- Production
- 1970–1977
Dial versions
This reference was made with these dials and finishes.
5645
5645-7010
How it compares within the 56GS family
Side by side with other references in the same collection, from the catalog.
About the 56GS family
The 56GS, introduced in 1970, is an automatic Grand Seiko running at 28,800 vibrations per hour. It was produced into the later 1970s with date and day-date versions, on calibers 5641, 5645 and 5646.
It is one of the more accessible vintage Grand Seiko families. Buyers check the case for sharp lines, the dial and hands for originality, and the automatic winding and date change for correct function.
Quick answers
- What movement does the Grand Seiko Grand Seiko 56GS 5645-7010 5645 use?
- It uses the automatic caliber 5645.
- Is the Grand Seiko Grand Seiko 56GS 5645-7010 5645 still in production?
- No. It was made until 1977.
- When did the Grand Seiko Grand Seiko 56GS 5645-7010 5645 come out?
- It was introduced in 1970 and made until 1977.
Catalog facts checked October 2026.