(*) Magic lever system by Seiko
The Magic Lever System is a special automatic winding mechanism developed by Seiko in 1959. It is still used today in many of their movements, such as the 7S26, 4R35, NH35, and 6R15.
What does it do?
It’s an automatic winding system that converts the movement of the rotor (oscillating weight) into energy to wind the mainspring. The key feature of the Magic Lever is its simple yet highly efficient lever mechanism, which allows it to utilize rotor movement in both directions—clockwise and counterclockwise.
How does it work?
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The rotor spins as the wearer moves their wrist.
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The Magic Lever, a specially shaped double-ended pawl, picks up this motion.
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Thanks to its design and dual-tooth engagement, it can transfer energy to the winding mechanism regardless of the direction of the rotor.
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This results in fast and efficient winding.
Advantages of the Magic Lever System:
✅ Bidirectional winding – utilizes movement in both directions.
✅ Simple construction – fewer parts, cost-effective, and easier to maintain.
✅ Reliable – robust and durable, even under tough conditions.
✅ Simple construction – fewer parts, cost-effective, and easier to maintain.
✅ Reliable – robust and durable, even under tough conditions.
Comparison to other systems:
Many Swiss movements, such as the ETA 2824-2, use more complex winding systems with reverser wheels. These are precise but can be more sensitive to wear and harder to service. The Magic Lever, by contrast, follows Seiko’s philosophy of “smart simplicity”—a clever solution using minimal components.
