Thomas Sweazey, Byron Sweazy - Master Watchmaking Lesson 20
Chicago School of Watchmaking | 1962 | ISBN: N/A | English | 14 pages | PDF | 3.6 MB
Chicago School of Watchmaking | 1962 | ISBN: N/A | English | 14 pages | PDF | 3.6 MB
A home study booklet on watch repair. Lesson 20: The Overcoil Hairspring. Sections 390-393.