This is a grade 376 Elgin, Veritas model. It is a 16 size 23 jewel movement, featuring an up/down wind indicator and motor barrel.
When you change out an Elgin balance staff, the old one is removed by cutting off very close to the entire hub in the lathe. The remaining bit is popped off in the staking tool. This prevents any damage to the arms of the balance wheel, and you get a free tiny washer!
In this picture we see the new staff, upper, and what's left of the old staff.
This fine example was made about 1915.
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