This is the fly pinion for the Constant Force Escapement, the pivots have been turned to 0.35mm dia now the pinion can be parted off the steel stock
Watch video Cutting off a pinion online without registration, duration hours minute second in high quality. This video was added by user David Walter Timepieces 09 August 2018, don't forget to share it with your friends and acquaintances, it has been viewed on our site 112 once and liked it 0 people.