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...
Duo-Tone
Waltham P.S. Bartlett #22295427 with Duo-Tone Plates For a short time in the late 1910s, the American Waltham Watch Company produced 16-Size P.S. Bartlett and No. 620 movements with duo-tone.