Horology Zone Free Watch School
Watch Repair Tools Shop

Free Watch School Repairing Tools Shop

Horology A ~ Z

Horology O
O-Ring An rubber O-shaped ring, It is used to seal the gaps, e.g. the gap between the watchcase and the case back.
Oscillating System The oscillating system is formed by the hairspring and the balance. Two vibrations of the balance create the ticking sound of a mechanical watch, known as 1 oscillation.
Overcoil Hairspring A hairspring where the final (or terminal) curve is elevated above the plane of the rest of the spring.

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