Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
24 Hour Hand
Date
-Quick Date Correction
Hacking Seconds
Hand Winding
Hands
24 Hour Hand at 10:30
Brand
Seiko
-Seiko Instruments Inc.
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
ETACHRON
Production Periods
2010s
2020s
Frequency
21,600 A/h
Anti-Shock
Diashock
Jewels
24
Balance Mount
Balance Cock
-Balance Cock Counter-Clockwise
Back-Side Features
Balance
-Balance at 3:00
Central Rotor
Seiko 4R37
Seiko 4R39
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