![Master Watchmaking Lesson 21](/media/uploads/2019/1/31/master-watchmaking-lesson-21.jpg)
Master Watchmaking Lesson 21
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Thomas Sweazey
A home study booklet on watch repair. Lesson 21: Principles of the Lever Escapement. Sections 395-403.
A home study booklet on watch repair. Lesson 21: Principles of the Lever Escapement. Sections 395-403.