Grail Watch Reference
A Reference Library for Watches from Grail Watch
Movement Database
Grail Watch Blog
The Watch Files Podcast
Reference Documents
1979 Citizen Movement Table
Seiko Blue Book Automatic Movement Chronology
Seiko Laurel Brochure
Seiko List of Basic and Derivative Calibres
About Grail Watch
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Complications
Hands
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Brand
Seiko
-Daini Seikosha
-Grand Seiko
Winding
Hand winding
Regulators
Screw Regulator
Production Periods
1960s
1970s
Frequency
36,000 A/h
Anti-Shock
Jewels
25
Balance Mount
Balance Bridge
Back-Side Features
Balance
-Balance at 3:00
Seiko 4580
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