This is another Elgin Veritas, grade 376, 16 size, 23 jewels, made about 1912.
Here are some details showing the
motor barrel, also called a "
safety barrel." Like a safety pinion, the safety barrel protects the train in the event of a sudden release of power (mainspring breaking), among other advantages.
This shows some detail of the balance cock, which provides the upper jeweling for the balance wheel pivots. The cap jewel, covering the upper pivot is a natural diamond chip on this
Elgin Veritas model (
railroad grade).
Through the moving balance wheel, we can see the pallet stones acting on the teeth of the escape wheel.
This is another Elgin Veritas, grade 376, 16 size, 23 jewels, made about 1912. 
Here are some details showing the motor barrel, also called a "safety barrel." Like a safety pinion, the safety barrel protects the train in the event of a sudden release of power (mainspring breaking), among other advantages.
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