The Keystone Standard Watch Company

This is a Keystone Standard Watch Company 18 size, 15 jewel, "dust proof" model, lever-set, in a hunter case, gold filled.

Note the transparent window near the balance cock.
The Keystone company, establishes in 1886, existed formally as the Lancaster Watch Co., and was sold to Hamilton in 1891.



Here's some detail on the dial side lever mechanism.



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