Grail Watch Reference
A Reference Library for Watches from Grail Watch
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Complications
-Instant Day Change
Hands
Central 24 Hour Hand
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Day Window at 12:00
Day Window at 3:00
Brand
ETA
Seiko
-Suwa Seikosha
Tianjin
-Sea-Gull
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Battery
Hand winding
Regulators
ETACHRON
Quartz
Screw Regulator
Stepper Motor
Production Periods
1970s
1980s
1990s
2000s
2010s
2020s
Frequency
16,384 Hz
21,600 A/h
28,800 A/h
32,768 Hz
Anti-Shock
Novodiac
Jewels
17
21
25
26
7
Balance Mount
Balance Cock
-Balance Cock Clockwise
-Balance Cock Counter-Clockwise
Back-Side Features
Balance
-Balance at 10:30
-Balance at 12:00
-Barrel at 7:30
-Battery at 10:30
Central Rotor
ETA 2688
ETA 2834-2
ETA 2836-2
ETA 2846
ETA 2858
ETA 2859
ETA 2878
ETA 2879
Seiko 3803A
Seiko 3819A
Seiko 3823A
Seiko 3863A
Seiko 3883A
ST2100
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