This is an unusual T. M. Avery model. This early Elgin design includes
several features rare among Elgin pocketwatches. For one thing, this is
a truly full plate design with no upper bridges at all, aside from the
balance cock. The inside is fully covered, including the barrel, and
under the balance. Which dust covers in place, the inside is well
closed off. Yet, like a 3/4 plate design, the balance is inset. 
There's also a unique ratchet, set in a recess under an extra plate, back side.
Then there's the solid silver balance wheel of course...
This watch is key-set from the rear, notice the square post in the center. A shaft passes though the center wheel staff, which is actually a hollow tube, and the cannon pinion mounts to that shaft on the front. Friction from the inside of the center tube moves the pinion, and hands, when the watch is running.
The watch is in excellent condition, virtually no tool marks. Good thing we don't need parts for this.



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