Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
Date
-Date by Pointer
-Quick Date Correction
Hacking Seconds
Hand Winding
Power Reserve Indicator
Hands
Central Power Reserve Pointer
Brand
Seiko
-Seiko Instruments Inc.
Zenith
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
ETACHRON
Production Periods
2000s
2010s
2020s
Frequency
21,600 A/h
28,800 A/h
Anti-Shock
Diashock
Jewels
27
29
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 4R57
Zenith 68
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