It wasn't so. While testing the watch again, it kept inexplicably stopping while running pendent up. Now, this is an Elgin Veritas model, in very good condition, with an excellent amplitude and extremely low beat error. These are among the best railroad watches ever made. In addition, it's been worked on a few times in the past, clearly, but as far as how it runs it's as close to "like new" as you will ever find. I could not find a thing wrong, for several days. Nothing I tried to tweak cured the stopping. Hands? FIne. Hour wheel lifting, nope. Banking too tight? no. Balance flat? Check. etc...
Finally, I realized that the roller jewel is loose. Before anyone thinks that I should have checked that both originally, and later, I did. Oddly, the jewel is so snug that it seems fine. It will just move only by the slightest about - and I mean you can barely feel it every so slightly responding to a little pressure for the tweezers. It's mostly up and down, so I think it was sliding down enough to interfere with the guard pin, in one orientation.
Quick fix, testing again now...
See the entire album for this project here.
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