This is an 18 size, 11 jewel, American Waltham pocketwatch, made about 1879.
It is a lever-set Wm. Ellery model.
It didn't take long to change the hole in the lathe.
The stem had pushed though the thing it is supposed to push on to move the latch spring. The latch had to come out to get at that small brass part, which also holds the stem in from the bottom, as it turned out, in addition to the screw in the neck. It's an old style case.