Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
-Retrograde Day
Hands
24 Hour Hand at 9:00
Central 24 Hour Hand
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Pointer at 6:00
Day Pointer at 3:00
Power Reserve Pointer at 9:30
Retrograde Day Pointer at 2:30
Brand
Seiko
-Credor
-Seiko Instruments Inc.
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
ETACHRON
Screw Regulator
Production Periods
2000s
2010s
2020s
Frequency
28,800 A/h
Anti-Shock
Diashock
Jewels
28
31
Balance Mount
Balance Cock
-Balance Cock Clockwise
-Balance Cock Counter-Clockwise
Back-Side Features
Balance
-Balance at 3:00
-Balance at 4:30
-Barrel at 12:00
Central Rotor
Seiko 4S27
Seiko 4S36
Seiko 4S76
Seiko 4S77
Seiko 6R24
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