Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
24 Hour Hand
Date
-Instant Date Change
-Quick Date Correction
GMT Hand
-Independently-Adjustable 24 Hour Hand
Hacking Seconds
Power Reserve Indicator
Hands
Central 24 Hour Hand
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Date Window at 4:30
Power Reserve Pointer at 1:00
Small Seconds Hand at 9:00
Brand
Seiko
-Seiko Instruments Inc.
--Time Module Inc.
Zenith
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
-Seiko Magic Lever Winding
Regulators
ETACHRON
Production Periods
1990s
2000s
2010s
Frequency
21,600 A/h
28,800 A/h
Anti-Shock
Diashock
Jewels
21
27
Balance Mount
Balance Cock
-Balance Cock Clockwise
-Balance Cock Counter-Clockwise
Back-Side Features
Balance
-Balance at 1:30
-Balance at 3:00
-Barrel at 7:30
Central Rotor
Seiko 7S25
Zenith 672
Zenith 683
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