Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
Date
Day
GMT Hand
Hacking Seconds
Hands
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Day Window at 3:00
Brand
Bulova
Winding
Battery
Regulators
Quartz
Tuning Fork
Production Periods
1960s
1970s
Frequency
32,768 Hz
360 Hz
440 Hz
8,192 Hz
Anti-Shock
Jewels
15
Balance Mount
Back-Side Features
Battery
-Battery at 4:30
-Battery at 6:00
Tuning Fork
-Tuning Fork at 1:30
-Tuning Fork at 12:00
Bulova Accutron
Accuquartz 224
Accutron 214
Accutron 218
Accutron 219
Accutron 221
Accutron 230
Beta 21
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