This movement had trouble dial up. There's several common causes of that, but this movement did not have any of those issues. I tried other jewels, and polishing the pivot (using a balloon chuck, shown here).
Under extra high magnification it looks like the pivot may be bent. It is so slight that I can't be sure I'm not just seeing a reflection. It *really* looks fine.
But having no other ideas left, I changed the staff out. The movement now regulates excellently. Just strange, I would have sworn there was nothing wrong with that staff. But sometimes it just goes like this.
Elgin serial number 13891376 is a grade 368, 18 size, 17 jewels, made about 1909.
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