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
24 Hour Hand
Date
-Quick Date Correction
Day
-Bilingual Day Wheel
GMT Hand
-Independently-Adjustable 12 Hour Hand
Hacking Seconds
Hand Winding
Hands
Central 24 Hour Hand
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Day Window at 3:00
Open Heart at 5:00
Brand
Blancpain
Kenissi
Miyota
Norqain
Seiko
-Credor
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
-Uni-Directional Automatic Winding
--Clockwise Automatic Winding
Hand winding
Regulators
Screwed Balance
Production Periods
1950s
1960s
1970s
1990s
2000s
2010s
2020s
Frequency
21,600 A/h
28,800 A/h
Anti-Shock
Citizen Parashock
Incabloc Double-Cone
Jewels
17
21
22
24
27
28
Balance Mount
Balance Bridge
Balance Cock
-Balance Cock Clockwise
-Balance Cock Counter-Clockwise
Back-Side Features
-Balance at 7:00
Blancpain R-550
Miyota 6T15
Miyota 6T28
Miyota 6T33
Miyota 6T51
Miyota 9015
Miyota 9039
Norqain NN20/1
Norqain NN20/2
Seiko 6810
Seiko 6870
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