Grail Watch Reference
A Reference Library for Watches from Grail Watch
Movement Database
Patent Database
Grail Watch Blog
The Watch Files Podcast
Reference Documents
Vocabulary
About Grail Watch
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Complications
Hacking Seconds
Hand Winding
Hands
Open Heart at 12:00
Brand
STP
Winding
Automatic
-Bi-Directional Automatic Winding
-Central Rotor Automatic Winding
Regulators
Screw Regulator
Production Periods
2010s
2020s
Frequency
28,800 A/h
Anti-Shock
Incabloc Double-Cone
Jewels
20
26
Balance Mount
Balance Cock
-Balance Cock Clockwise
Back-Side Features
Central Rotor
STP5-15
STP5-15M
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