Grail Watch Reference
A Reference Library for Watches from Grail Watch
Movement Database
Patent Database
Grail Watch Blog
The Watch Files Podcast
Reference Documents
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About Grail Watch
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Complications
Hacking Seconds
Hands
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Brand
ETA
Seiko
-Suwa Seikosha
Winding
Battery
Regulators
Quartz
Stepper Motor
Production Periods
1960s
1970s
1980s
Frequency
16,384 Hz
32,768 Hz
Anti-Shock
Jewels
7
Balance Mount
Back-Side Features
-Battery at 10:30
ETA 2750 Family
Seiko 3820A
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