Matching Serial Numbers? Last week, I posted a c.1918 Waltham Duo-Tone P.S. Bartlett that featured unusual gilt-damaskeened upper plates paired with a nickel pillar plate and balance cock. This spurred a discussion questioning whether the serial numbers on the individual parts would match. While evidence...
Parts
I had never seen a balance staff diagram with the balance, roller, and hairspring placement superimposed - so I created one. This diagram shows the parts of the balance staff.
Pictured: Deconstructed Parts from a Grade No. 73 Non-Magnetic Watch Co. of America Movement, #65426 An inspection of the Badollet Model sold by the Non-Magnetic Watch Company reveals the movement.