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
Date
-Big Date
--Double Concentric Wheel Big Date
-Instant Date Change
-Quick Date Correction
Hacking Seconds
Moon Phase
Hands
Big Date at 1:30
Central Hour Hand
Central Minute Hand
Moon Phase Wheel at 6:00
Small Seconds Hand at 9:00
Brand
Zenith
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
Production Periods
2010s
Frequency
28,800 A/h
Anti-Shock
Jewels
27
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
-Balance at 1:30
Zenith 691
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