Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9R31, 9R31A Movement Type Automatic, Spring Drive In-House? Yes Jewels 30 Frequency...
Spring Drive
Manufacturer Grand Seiko (Seiko Watch Corporation) Caliber Number 9R65, 9R65A Movement Type Automatic, Spring Drive In-House? Yes Jewels 30 Frequency...
Brand Seiko Caliber Number 5R65 Movement Type Automatic Jewels 30 Diameter 30mm Height 5.1mm Power Reserve 70+ hours Frequency 32,768...
Seiko caliber 9R86 found in the Grand Seiko Spring Drive model SBGC005. 50 jewels and consisting of 416 parts. Made in Japan.
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