This is a grade 315, 12 size, 15 jewels, made about 1926.
This was a very popular Elgin product.
This watch needed a balance staff.
The old staff is separated from the balance wheel with the lathe and the staking set. The remains of the hub, once broken off, is a little washer. I like to save these, you never know...
See the whole
album for this project here.
Testing the motion of the new staff, I find it works well. I did have to reduce the upper pivot some though first. Replacement parts are often not quite right.
I do find though that the balance cock does not sit securely flat. It wants to rock a little. There are two divots cut into the plate from some past repair (to raise the balance cock, likely because the upper pivots on the staff were too big for the upper jewel).
The hairspring collet does not fit the replacement staff. I use this tool to squeeze it closed a bit.
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