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
Date
-Big Date
--Double Wheel Big Date
Day/Night Indicator
GMT Hand
-Independently-Adjustable 12 Hour Hand
Modular
Hands
Hour Hand at 6:00
Brand
Soprod
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
Soprod
Production Periods
2010s
2020s
Frequency
28,800 A/h
Anti-Shock
Incabloc Double-Cone
Jewels
25
Balance Mount
Back-Side Features
Soprod C120
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