![Master Watchmaking Lesson 20](/media/uploads/2019/2/3/master-watchmaking-lesson-20.jpg)
Master Watchmaking Lesson 20
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Thomas Sweazey
A home study booklet on watch repair. Lesson 20: The Overcoil Hairspring. Sections 390-393.
A home study booklet on watch repair. Lesson 20: The Overcoil Hairspring. Sections 390-393.