Grail Watch Reference
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Complications
-Bilingual Day Wheel
Hands
Central 24 Hour Hand
Central Hour Hand
Central Minute Hand
Central Seconds Hand
Date Window at 3:00
Day Window at 3:00
Brand
ETA
Miyota
Seiko
-Daini Seikosha
-Seiko Instruments Inc.
-Suwa Seikosha
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
-Uni-Directional Automatic Winding
--Clockwise Automatic Winding
--Counter-Clockwise 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
Citizen Parashock
Diashock
Jewels
17
21
23
24
25
7
Balance Mount
Balance Cock
-Balance Cock Clockwise
-Balance Cock Counter-Clockwise
Back-Side Features
Balance
-Balance at 12:00
-Balance at 3:00
-Balance at 4:30
-Balance at 7:30
-Barrel at 7:30
-Battery at 10:30
Central Rotor
ETA 2858
ETA 2859
ETA 2878
ETA 2879
Miyota 6T51
Miyota 8205
Seiko 3803A
Seiko 3819A
Seiko 3823A
Seiko 3863A
Seiko 3883A
Seiko 4R36
Seiko 5206
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