Home / Keystone Watch Co. / c.1887 Keystone Watch Co. Patent “Dust Proof” Watch – 18-Size, Gilt-Damaskeened Plates, 10 Jewels

c.1887 Keystone Watch Co. Patent “Dust Proof” Watch – 18-Size, Gilt-Damaskeened Plates, 10 Jewels

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c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Movement
c.1887 Keystone Watch Co. Patent “Dust Proof” Watch: Movement

c.1887 Keystone Watch Co. Patent “Dust Proof” Watch – 18-Size, Gilt-Damaskeened Plates, 10 Jewels, ETP ~7,400. In addition to Abraham Bitner’s Patent Micrometric Regulator, this watch features many other patents issued to Bitner during his leadership at the Keystone factory.


c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Dust-Proof Window Closeup
c.1887 Keystone Watch Co. Patent “Dust Proof” Watch: Dust-Proof Window Closeup

The prominent “Dust-Proof” feature was accomplished with a windowed attachment covering the balance wheel – essentially “sealing” the mechanics of the watch from outside debris.


c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Dial
c.1887 Keystone Watch Co. Patent “Dust Proof” Watch: Dial

This watch is correctly fitted with “Keystone” shape gilt hands and is housed in a gold-filled case manufactured at the Essex Watch Case Company using the “Standard” name and trademark.


c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Standard Case Marking
c.1887 Keystone Watch Co. Patent “Dust Proof” Watch: Standard Case Marking

In the late 1880s, the Atkinson Bros. company sold these as complete watches via various schemes, including the formation of watch clubs in major cities across the United States.


Keystone Watch Co. Dust-Proof Advertisement in the Jewelers' Circular: May 1889
Keystone Watch Co. Dust-Proof Advertisement in the Jewelers’ Circular: May 1889

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