Grail Watch Reference
A Reference Library for Watches from Grail Watch
Movement Database
Patent Database
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About Grail Watch
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Complications
Hacking Seconds
Hand Winding
Power Reserve Indicator
Hands
Open Heart at 10:00
Brand
Seiko
-Credor
-Shizukuishi Watch Studio
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
-Seiko Magic Lever Winding
Regulators
Screw Regulator
Production Periods
2000s
2010s
Frequency
28,800 A/h
43,200 A/h
Anti-Shock
Diashock
Jewels
26
41
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
Balance
-Balance at 1:30
Central Rotor
Seiko 8L38
Seiko 8L88
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