This one is a grade 288, 18 size, 7 jewels, made about 1910.
On an Elgin watch like this, one of the plate screws sits flush and is covered on complete assembly by the balance cock. When a watch has not been worked on a million times, and the screws all beat up, switched around, lost and replaced, the covered screw has an unfinished, unpolished head.
The screws are all the same, and interchangeable, otherwise. The extra step of polishing the screw head was cost-effective in those days to skip, where the screw wouldn't show.
Interesting jeweling choice on this grade...
The upper escape pivot is jeweled, but the rest of the train is not, including the pallet.
One the bottom side, the 3rd and forth wheel pivots are jeweled, only. The escape and pallet pivots are plain.
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