Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
Date
-Big Date
--Double Concentric Wheel Big Date
-Instant Date Change
-Quick Date Correction
Hacking Seconds
Moon Phase
Hands
Big Date at 1:30
Brand
Zenith
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
Production Periods
2010s
Frequency
28,800 A/h
Anti-Shock
Jewels
27
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
-Balance at 1:30
-Barrel at 7:30
Central Rotor
Zenith 691
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