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
Chronograph
-Column Wheel Chronograph
--6-Column Chronograph
-Rattrapante Chronograph
Hands
30 Minute Chronograph Hand at 3:00
Central 60 Second Chronograph Hand
Central Hour Hand
Central Minute Hand
Small Seconds Hand at 9:00
Brand
Minerva
Winding
Hand winding
Regulators
Production Periods
1920s
Frequency
18,000 A/h
Anti-Shock
Jewels
17
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
Minerva 25
Minerva 9 CH
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