Grail Watch Reference
A Reference Library for Watches from Grail Watch
Movement Database
Grail Watch Blog
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
24 Hour Hand
Date
-Date by Pointer
-Quick Date Correction
Day
-Quick Day Correction
-Retrograde Day
GMT Hand
-Independently-Adjustable 24 Hour Hand
Hacking Seconds
Hand Winding
Modular
Power Reserve Indicator
Hands
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Pointer at 6:00
Power Reserve Pointer at 9:30
Retrograde Day Pointer at 2:30
Small Seconds Hand at 6:00
Brand
Seiko
-Shizukuishi Watch Studio
Winding
Automatic
-Bi-Directional Automatic Winding
-Seiko Magic Lever Winding
Hand winding
Regulators
Screw Regulator
Production Periods
2000s
Frequency
28,800 A/h
Anti-Shock
Diashock
Jewels
24
28
29
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
Balance
-Balance at 2:00
-Balance at 5:00
Seiko 4S27
Seiko 4S29
Seiko 8L21
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