Why Seiko Runs at A Lower Amplitude

Why do vintage Seiko movements show lower balance amplitude than Swiss watches like the ETA 2824-2? Is something wrong – or is it by design?

In this video, we explore one of the most misunderstood concepts in mechanical watchmaking: balance amplitude. You'll learn:

✅ Why Seiko watches are engineered to run at lower amplitudes
✅ Key differences in mainspring strength, escapement geometry, jewel count, and lubrication choices
✅ How Swiss and Seiko priorities led to different design trade-offs
✅ Why 240° amplitude in a Seiko 7S26 might be totally normal

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