This style of lever-setting mechanism is remarkably clever, but for good reason it wasn't used by Elgin for long. Note the setting wheel in the center with teeth both inside and outside. The tension on this, so is stays engaged on the cannon pinion, is critical and hard to get just right.
Elgin serial number 3793826 is a grade 70, 18 size, 15 jewels, made about 1890. This is a B.W. Raymond model.
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