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
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Complications
Year
Hands
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Pointer at 12:00
Date Pointer at 3:00
Day Pointer at 3:00
Day Pointer at 9:00
Month Pointer at 9:00
Month Window at 12:30
Moon Phase Wheel at 6:00
Moon Phase Wheel at 9:00
Open Heart at 6:00
Year Wheel at 9:00
Year Window at 11:30
Brand
ETA
Tianjin
-Sea-Gull
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
Production Periods
1990s
2000s
2010s
2020s
Frequency
21,600 A/h
28,800 A/h
Anti-Shock
Incabloc Double-Cone
Jewels
21
29
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
Balance
-Balance at 12:00
ETA 2890-9
ETA 2891-9
ST2503
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