This antique wheel and pinion mill was out of the Hamilton Watch factory in Lancaster, PA.
It was once used to make parts for highly-precise marine chronometers and still has a DOD
inspection sticker. The tooling would indicate that it was used for making pinions. It has
double collet chucks for each arbor. The larger is a metric size 15mm with 13mm x 1.0
threads - unidentified at this time, and the smaller collet is 8mm.