What a neat thread!
My old pocket watch is my great grandfathers. Not railroad, he was a steamship engineer from ~1880-1920s. The watch is a Keystone dustproof which dates it from 1886-1891. It has not run longer for more than my 60+ years and everyone I have taken it too just says it cannot be fixed. It is in a hunter case which no one has been able to identify to me. The case just has 3 acorns and a serial number. I have also been told that the acrylic crystal is original and somewhat unique to Keystone's being of the same material as the dustproof window on the mechanism. I didn't even know acrylics had been around that long.
My other pocket watch is a Bulova Accutron which I was told is an authorized railroad wrist watch in a pocket watch case.
The Keystone Dustproofs are interesting movements and are an evolution of the Adams and Perry and Lancaster movements made in the same factory that would eventually house the Hamilton Watch Company(although much of the Hamilton machinery came from the Aurora Watch Company).
These can be fixed, and I know of an individual who had balance staffs made for them in China a few years back.
