Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
Date
-Quick Date Correction
Day
-Quick Day Correction
Hacking Seconds
Hand Winding
Hands
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Day Window at 3:00
Brand
Seiko
-Daini Seikosha
Winding
Automatic
-Bi-Directional Automatic Winding
Regulators
Tadpole Regulator
Production Periods
1970s
Frequency
28,800 A/h
Anti-Shock
Diashock
Jewels
23
25
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
Balance
-Balance at 4:30
Seiko 5216
Seiko 5245
Seiko 5246
Seiko 5256
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