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
-Instant Day Change
Hands
Central 24 Hour Hand
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Day Window at 12:00
Day Window at 3:00
Brand
ETA
Seiko
-Suwa Seikosha
Tianjin
-Sea-Gull
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Battery
Hand winding
Regulators
ETACHRON
Quartz
Screw Regulator
Stepper Motor
Production Periods
1970s
1980s
1990s
2000s
2010s
2020s
Frequency
16,384 Hz
21,600 A/h
28,800 A/h
32,768 Hz
Anti-Shock
Novodiac
Jewels
17
21
25
26
7
Balance Mount
Balance Cock
-Balance Cock Clockwise
-Balance Cock Counter-Clockwise
Back-Side Features
Balance
-Balance at 11:00
-Balance at 12:00
-Battery at 11:00
ETA 2688
ETA 2834-2
ETA 2836-2
ETA 2846
ETA 2858
ETA 2859
ETA 2878
ETA 2879
Seiko 3803A
Seiko 3819A
Seiko 3823A
Seiko 3863A
Seiko 3883A
ST2100
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